329 
Wings rudimentary, reaching only to the anterior margin of the pro- 
podeum. Legs of the normal length and structure, the middle tarsi taper- 
ing toward the apex, the first joint nearly as long as the following joints 
combined; spur of middle tibiae a little shorter than the first joint of the 
tarsus; hind tibiae with two short unequal apical spurs; hind tarsi slender, 
the first joint about equal to the last three joints combined. 
Abdomen unusually large, or fully as long as the head and thorax com- 
bined, and much wider, convex above and beneath, with the apical part of 
the dorsum behind the vibrissal plates often, but not always, shrunken in 
after death; first tergite about twice as long as the second, which, with 
the following, except the last, decrease successively in length, the apical 
one being nearly as long as the three preceding combined; vibrissal plates 
or cerci situated at one-fourth the length of the abdomen from the apex; 
ovipositor entirely enclosed and concealed by the ventrites and without 
protruding sheaths. 
Frontovertex very finely lineolate; pronotum and mesonotum and _ first 
tergite of abdomen finely reticulate; other parts of the body mostly smooth. 
Vestiture throughout very fine and sparse, being most abundant and con- 
spicuous on the collar of the pronotum and on the mesoseutum; apex of 
the seutellum with a small, short fasicle of hairs consisting of about twelve 
fine black setae arranged in a transverse row close together, the outer pair 
of setae very short, the middle setae longest. 
Male. With fully developed wings and very similar to the male of 
Chrysoplatycerus. Head considerably thicker fronto-occipitally, the occiput 
very deeply concave; as seen from above, well rounded on the sides, trans- 
verse anteriorly between the eyes and deeply emarginate at the occipital 
margin; in side view the dorsal and facial sides of the triangular outline 
are about equal. Antennae agreeing closely, the scape short, very slender 
in dorsal view, but compressed and somewhat expanded below, concave on 
the outer surface, pedicel about as long as thick at apex, and not much 
smaller than the first funicle joint; flagellum stoutly cylindrical, the funicle 
not tapering distad, each joint about as long as thick and nearly circular 
in cross-section, club solid and as long as the two and one-half preceding 
joints combined; entire funicle densely clothed with extremely fine short 
hairs, the elub more sparsely pubescent; sensoria of the flagellum incon- 
spicuous and not producing a rugose effect as in Chrysoplatycerus. Mouth 
parts as in the female. 
Notum of the thorax very convex from side to side; the collar of pro- 
notum very narrow and strongly arcuate; axillae very acute and meeting 
at their inner tips under the overlapping margin of the mesoseutum; scu- 
tellum rounded at apex. Fore-wings moderately wide, not triangular in 
shape, as in Chrysoplatycerus; marginal cilia short, the discal pubescence 
moderately dense and covering entire membrane, excepting the rather wide 
speculum; venation as in Chrysoplatycerus, except that the marginal vein 
is no longer than thick, the submarginal slightly thickened in the distal 
third of its course, and not thickened toward the base. Abdomen and legs 
