544 
ZOOLOGICAL LITERATURE. 
a. Third antennal joint prolonged in $ . 
18. Rhaphium. 
b. Third antennal joint not prolonged in $ . 
— Third antennal joint of <S very much prolonged. 
19. XiPHANDRIUM. 
= Third antennal joint of <S moderately prolonged. 
20. PORPUYROPS. 
B. Third antennal joint short, or if prolonged not pointed, arista subapical. 
* Fourth longitudinal vein forked 43. Psilopus. 
t Fourth longitudinal vein simple. 
a. Upper side of thorax convex behind. 
1. Fifth longitudinal vein wanting .... 38. Achalcus. 
2. Fifth longitudinal vein distinct. 
a. Distance of posterior transverse vein from margin at least 
equal to its own length. 
a. Posterior transverse vein unusually oblique. 
34. Plagioneurus. 
b. Posterior transverse vein but little oblique. 
— Ilypopygium distinctly bent under the venter. 
** Face very broad, not narrowed above. 
23. Tiiinophilus. 
tt Face rather narrow, somewhat narrowed above. 
24. Peodes. 
= Hypopygium not distinctly bent under the venter, or 
entirely imbedded. 
** Outer appendages of hypopygium long, filiform. 
25. Nematoproctus. 
tt Outer appendages of hypopygium not long or filiform, 
aa. Third antennal joint large in c? . 
2G. Leucostola. 
j8/3. Third antennal joint small in (f. 
i. Pulvilli of fore tami in (5' much enlarged, pro- 
longed 28. Diaphorus. 
ii. Pulvilli of foi-e tarsi in cf much enlarged, not 
prolonged 27. Eutarsus. 
iii. Pulvilli of fore tai*si in J only slightly enlarged. 
Arista apical or nearly apical j wings large. 
29. Lyroneurus. 
Arista apical or nearly apical ; wings small. 
30. Ohrysotus. 
Arista dorsal ; feet of cf with isolated spine-like 
bristles 31. Teuchophorus. 
Arista dorsal ; feet without isolated spine-like 
bristles. 
Face not naiTowed above. 
32. SVMPYCNUS. 
Face narrowed above. 33. Campsicnemus. 
