8 Myron Harmon Swenk ‘ 
large; front wings with three cubital cells, the first along the cubitus fully 
or nearly as long as the second and third which are subequal, together; 
first recurrent nervure received by second cubital cell at its middle, second 
recurrent nervure sinuate or somewhat S-shaped, received by third cubital 
cell beyond its middle; hind femora of 2 with a pollen brush, the hind 
tibiae without a knee plate; head and thorax usually densely pubescent 
and abdomen usually fasciate; base of metathorax (propodeum) usually 
with a superior face defined by a ridge and divided into pits by longitud- 
inal carinae. 
KEY. TO. SP Beles 
FEMALES 
Thorax above, or at least fringe on scutellum, with black hairs. 
1. Anterior coxae without spines, or, 1f present, short and rudimentary. 2 
1; Anterior coxae with long, distinct, hairy sspimes. ose. oe euler 19 
2. Basal abdominal segment strongly and distinctly punctured.. 3 
2. Basal abdominal segment weakly and indistinctly punctured, 
oF ,SsubimpiumGtate = pnde4 ee eat ee nee es eee eae is lies 
3. Clypeus strongly convex, closely, evenly, and strongly but not , 
striately punctured; antennae verv short, joint 3 nearly = 4+5; 
malar space linear; no prothoracic spine; 9-10 mm....... brevicornis 
3. Clypeus weakly, non-striately punctured on an opaque, minutely 
lined surface; malar space one-sixth as long as broad; prothorax 
Bpinteds (B10 Amis ..: 5 sine ile see OST er a See eae ot qwillistont 
B IGiv pets punctured) othrerwisesr.nes cite uttee Cinnmemtere ester ie ieee 4 
4.Prothorax with prominent lateral spines? 25. 5+ stan Geen 5 
4-Prothorax -/ without spines... 42s cen ee TR Sei rary! 
5. Bowl of enclosure smooth and shining, not transversely rugose.... 6 
5. Bowl of enclosure coarsely transversely rugose, the rugae inter- 
fupted /in: a smMediary “line sictecien Wea ores ea ee ae 2 ee eee oa eee 10 
6. Postscutellum with a series of pits along anterior border; 
malar space linear; wings basally subhyaline, apically 
darkened: almost Nbanes sO-22) tonnes ens itso tence eal pers nudus 
6. Postscutellum without a series of pits on anterior border; 
malar; spacey welledetinedt. cance ocean leo ee area 7 
7. Basal joint of hind tarsi very short and broad, its length - not 
over two and one-half times its width, generally less; clypeus 
coarsely striate-punctate and broadly sulcate; spurs short and 
dark; malar space one-sixth as long as broad; 11-12 mm... .latitarsis 
7. Basal joint of hind tarsi more slender, three times as long as 
broad or more; clypeus with its punctures coarse but well-sep- 
ATATEA Ae thn arse pee PS 0 ince a mlath ips d ¥ials vcehe loot Ria Mia mba Rola Seen 8 
8. Malar space one-half as long as broad; outer hind tibial 
spur ‘not /péctinate;/ Lt) mim, |.) a cess eee epee ee ete ee 
50 
