48 PROCEEDINGS OF THE ACADEMY OF [1896. 



29. Nervures pallid 22 sphceralcece. 



Nervures dark 30 



30. Face and disc of mesothorax nearly bare, face below anteu- 



iise bright yellow 31 



Face and disc of mesothorax hairy 32 



31. Very small, abdomen yellow with pale suffused brown 



bands 43 biparticeps. 



Larger, abdomen dark with clean-cut interrupted light 

 bands 27 redan gulata. 



32. Head broader than long, distal band on 2d abdominal seg- 



ment broadly continued to lateral margin, dog-earmarks 



with more or less of a dark border below . 22 v. alticola. 



Head round, distal band of 2d abdominal segment failing 



some distance before lateral margin .... 38 hirsuta. 



33. Face all yellow (except the anteorbital spots) up to middle 



ocellus 29 hdeiceps. 



Face not all yellow up to middle ocellus . . 49 maculipes. 



34. Legs entirely orange-rufous, abdomen black, nervures 



brown 21 Joxi. 



Legs not orange-rufous, abdomen banded 35 



So. The yellow extending above antenna in median line ... 36 



The yellow not extending above antennae in median line . 41 



36. The yellow extending above across the face 37 



The yellow extending above only at sides and middle line . 39 



37. Larger, about 5 mm. long, face-markings resembling ^»<ter- 



rezioe 48 bigelovice. 



Smaller, about 4 mm. long 38 



38. Face yellow up to anterior ocellus 37 martini. 



Face not yellow up to anterior ocellus ... 45 cjntierrezke. 



39. Upward extension of yellow in median line narrow, shaped 



like a spear-head, abdomen above with only 3 or 4 bands, 



40 salicis. 

 Upward extension of yellow in median line broader ... 40 



40. Incursion of blue downward terminating at a right angle ; 



pleura dark 47 nltldella. 



Incursion of blue terminating at an acute angle ; pleura 

 largely yellow 36 exclamans. 



41. Cheeks armed, abdomen heavily banded . .12 mentzelioi. 

 Cheeks unarmed 42 



