Key to the Subgenera of Leioproctus of South America

1. T1-T4 in female and T1-T5 or T6 in male with enamellike apical marginal zones of yellowish, green, bluish, or whitish, these zones usually at least partly impunctate and hairless L. (Nomiocolletes)

—. Terga without enamel-like apical marginal zones, with hairs and punctures near apical margins that are concol-orous with other parts of terga, or translucent or brownish, or, rarely [in L. (Perditomorpha) eulonchopriodes Michener], with apical yellow bands, but the band ofT2

absent 2

2(1). Submarginal cells three 3

—. Submarginal cells two 14

3(2). Dorsolateral angle of pronotum produced as small tooth projecting upward and outward (smallest in male); basitibial plate of female not easily seen because its hairs are erect, similar to those ofadjacent parts oftibia, largely hiding marginal carinae L. (Halictanthrena)

—. Dorsolateral angle of pronotum low, rounded, scarcely evident; basitibial plate of female distinct, its hairs short, appressed, different from those of adjacent areas, its marginal carinae clearly exposed 4

4(3). Second submarginal cell on posterior margin usually at least three-fourths as long as third; second submarginal crossvein usually curved in a manner parallel to third, anterior margin of third submarginal cell thus at least two-

thirds as long as posterior margin 5

—. Second submarginal cell on posterior margin much shorter than third (as in Fig. 39-5d, f); second submarginal crossvein usually straight, at least not curved parallel to third, anterior margin of third submarginal cell usually less than two-thirds as long as posterior margin 6

5(4). Mandible ofmale with preapical tooth; outer hind tibial spur offemale pectinate, although more finely so than inner spur; metasoma with at least weak blue reflections

—. Mandible of male simple; outer hind tibial spur of female coarsely ciliate; metasoma black

L. (Cephalocolletes)

6(4). Thorax dull, minutely roughened, almost lacking punctures; malar area as long as minimum diameter of flagellum; clypeus protuberant in lateral view by fully eye width L. (Torocolletes)

—. Thorax with at least some areas of shining integument between strong punctures; malar area linear; clypeus not or little protuberant 7

7(6). Males (unknown in Hoplocolletes) 8

8(7). Subantennal suture little over half as long as diameter of antennal socket; supraclypeal and subantennal areas impunctate, shining, hairless, in conspicuous contrast to adjacent areas L. (Holmbergeria)

—. Subantennal suture as long as diameter of antennal socket; supraclypeal and subantennal areas punctate, with hairs 9

9(8). Gonoforceps hairy to base; gonobase one-half as long as gonoforceps; apex of S6 with broad, shallow emar-

gination; metasoma with pubescence all blackish

—. Gonocoxite (or coxal part of gonoforceps) hairless;

gonobase one-third as long as gonoforceps or less; apex ofS6 with the usual small, V-shaped (sometimes shallow) median emargination; metasoma with some or all hair pale, usually forming apical tergal bands 10

10(9). Labrum three times as wide as long, apical margin broadly emarginate L. (Chilicolletes)

—. Labrum little over twice as wide as long, apical margin convex or with small median emargination

11(7). Inner hind tibial spur finely pectinate (almost ciliate)

with over 25 teeth L. (Actenosigynes)

—. Inner hind tibial spur strongly pectinate with less than ten teeth 12

12(11). S2-S4 with apical bands of sparse, simple hairs not hiding surfaces of sterna L. (Chilicolletes)

—. S2-S4 with apical bands of long, dense hairs forming a ventral scopa that partially hides surfaces of sterna 13

13(12). Tibial and sternal scopal hairs with numerous short, fine branches projecting laterally from rachis (as in Fig.

—. Tibial scopal hairs dividing to form few major branches;

the sternal scopal hairs simple L. (Hoplocolletes)

14(2). Mandible of male simple; labrum about six times as wide as long, in female with apicolateral lobe bearing part of marginal fringe of bristles (Fig. 39-9a, b) 15

—. Mandible of male with preapical tooth on upper margin, as in female; labrum two to five times as wide as long, without apicolateral lobe (Fig. 39-9c) 16

15(14). Glossal lobes not much longer than basal width; scopal hairs of tibia and sterna with numerous short, fine branches (Fig. 13-1e); clypeal margin of male unmodified, truncate L. (Protodiscelis)

—. Glossa deeply divided, the lobes elongate, seven to ten times as long as basal width (as in Fig. 39-12); scopal hairs oftibia and sterna simple, or those oftibia with a few major branches; clypeal margin of male with short median lobe overhanging base of labrum L. (Tetraglossula)

16(14). Glossa deeply bifid, lobes about five times as long as basal width (Fig. 39-12a) L. (Glossopasiphae)

—. Glossal lobes short, not much if any longer than basal width 17

17(16). Labial palpus five- to nine-segmented, longer than maxillary palpus; hind tibia of male with strong carina from apex of basitibial plate to apex of tibia

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