50 
CHARLES ROBERTSON. 
Enclosure of metathorax triangular, defined by an impressed line or by absence 
of pubescence, continued to a point on posterior face of meta- 
tborax, rarely strongly rugous. 
Face in both sexes without yellow markings. 
Abdomen punctate. 
Not fasciate. 
Abdomen bare, strongly contrasting with the closely hairy thorax. 
Pubescence 9 hlack, except thorax above, vertex, and about base of 
antennse, 'J, paler, with black hairs along the eyes....bicoIor. 
Pubescence fulvous, abdomen black priiiii. 
Pubescence pale, abdomen mostly red 
Abdomen pubescent, not strongly contrasting with thorax, at most only 
thinly fasciate. 
Large, wings clouded Sayi. 
Smaller, wings clear erigeiiiae. 
Fasc iate violse. 
Abdomen impunctate, fasciate, enclosure of metathorax poorly defined. 
Abdomen black salicis. 
Abdomen slightly greenish, pubescent, scopa fuscous above. .erytliroiiii. 
Abdomen blue gerailii. 
Abdomen greenish, enclosure of metathorax narrow poleiiioiiii. 
Abdomen greenish, enclosure of metathorax broad illiuoieiisis. 
Clypeus of % yellowish, with a dark spot on each side. 
Clypeus alone yellowish ; abdomen impunctate. 
Large, stigma small, thorax densely pubescent lieliaiitlii. 
Smaller, abdomen fasciate, basal process of labrum 9 bifid..soli«laginis. 
Smaller, clypeus shining, impunctate, except on sides.. flavo-clypeata. 
Very small (6 — 7 mm.), abdomen greenish zizise. 
Clypeus and a spot on each side of face yellowish. 
Abdomen impunctate. 
Small, abdomen greenish zizise. 
Larger, abdomen black asteris. 
Abdomen punctate. 
Wings clouded, basal process of labrum bifid ru«lbecl<ije. 
Wings nearly hyaline, basal process of labrum small, shorL.Cressoiiii. 
Face in 9 with yellow markings. 
A yellow spot on each side pulcliella. 
Clypeus yellow aliciap. 
Enclosure of metathorax bounded by a salient rim, terminating at the edge of 
the declivity, commonly truncate, strongly rugous ; second seg- 
ment of abdomen bearing on each extreme side of base an 
opaque depression, which in the ferruginous species [marix) 
a]jpears as a black spot. 
Abdomen without fasci®, or the fasci® broadly interrupted. 
Thorax bare, very sparsely punctured iimla. 
Thorax with fulvous pubescence, closely and strongly punctured..riigosa. 
Thorax with pale pubescence, abdomen mostly red lllaria^. 
Abdomen with white fasci®, interrupted on second segment. 
Thorax with dark fulvous pubescence, strongly punctured Forbesii. 
Thorax with pale fulvous pubescence, feebly punctured elayloiiise. 
Belonging to first group, but unknown, marginal cell and beyond clouded. 
iiubecaila. 
