320 
ZOOLOGICAL LITERATURE. 
verso-cubital vein (or appendiculate) j recurrent veins received by 2nd and 
3rd cubital cells j mandibles bidentate. $ . Thorax transversely tripartite. 
Males. 
J. Hypopygium dentate or aculeate at apex. 
A. First cubital cell separated from anterior discoidal cell. 
1. Hypopygium narrow, briefly dentate or trilobate at apex (clypeiis 
ovate, subemarginate, or excised at apex). American. 
Elaphropteha (Gu^r.). 
2. Hypopygium produced into a distinct spine (clypeus produced and 
truncate at apex). Australasian. 
* Hypopygium small, concealed, produced into a strong, compressed 
spine, much curved at apex, commencing beneath 7th dorsal 
segment Khagigasteb (Guer.). 
t Hypopygium largo, trigonal, produced beyond 7th segment, pro- 
duced at apex into a small spine. 
a. Abdomen variable j maxillary palpi with 0 nearly equal joints. 
Thynnus (Fab.). 
h. Abdomen attenuate at base j maxillary palpi with joints 1-3 
minute, 4-6 very long Tachynomyia (Guor.). 
B. First cubital coll confluent with anterior discoidal cell. 
Iswaba (Westw.). 
II. Hypopygium unarmed. 
A. Maxillary palpi with 6 nearly equal joints. 
1. Hypopygium rather prominent, narrow, truncate at apex (c-lypeus 
ovate, subexcised at apex). American. 
FLAPHROPTEnA (Giier.). 
2. Hypopygium broader, subtrigonal or subquadrate, blunt or truncate 
at apex. Australasian Zeleboiua, g. n.‘ 
B. Maxillary palpi with joints 1-3 short, 4-6 very long. American. 
ylCLURUs (Klug). 
Femai.es (known at present). 
I. Body rather stout; abdomen thick, pygidium narrowed, dellexcd, or 
compressed; metathorax oblique, tranversely compressed, sublaniellnr ; 
claws furcate. 
A. Segment 2 of abdomen tranversely keeled. 
Thynnus. 
B. Segment 2 of abdomen transversely wrinkled. 
Elapiiroptera. 
II. Body slender, elongate, and narrow ; abdomen cylindric ; thorax flat- 
tened above ; metanotum longitudinal ; anus rounded, normal. 
A. Head quadrate, silicate on each side behind the eyes ; abdomen 
, , 1 Rhagigaster. 
depressed |diamma. 
B. Head not sulcate behind the eyes ; abdomen cylindrical ; claws 
, I ^Elurus. 
j(EmoNE.) 
The following genera are founded on the $ , the S being unknown : — 
• Zelehoria includes, of known species, 'Thynnus xanthorhei (Smith), curi- 
natus (Smith), (lej)rcssus (Westw.), odyncroulcs (Westw.), &c. 
