468 
antennal sinus, ocelli distinct. Pronotum excavate in middle, anteriorly 
produced into two processes corresponding closely to the two at apex of 
vertex, a small, raised process behind eyes, base of pronotum widely angu- 
larly emarginate; mesonotum about as long as wide, without carinae, hind 
tibiae with one spine near apex. 
According to Melichar’s latest arrangement of the Flatidae, 
this genus would form a new subtribe of the Nephesini. His 
subtribe Crytoflatini should be the typical subtribe, as it con- 
tains Nephesa Amy. Serv. 
Type T. wolcotti. 
Tetraceratium wolcotti sp. n. Plate XII, Figs. 6, a. 
Female. Length, 7 mm.; tegmen, 8 mm. 
Stramineous slightly tinged with green, in life probably green; veins 
of tegmen greenish; wings hyaline, opaquely white with waxy secretion, 
veins white. 
Anal segment large, flat, thin, in outline oval, anus near apex; pos- 
terior styles of ovipositor small, longer than wide, apex slightly pointed; 
anterior styles triangular, small; posterior margin of pregenital plate 
slightly angular. 
One female from Haina, Santo Domingo, R. D. (G. N. Wol- 
cott,, 1920, Noms). 
Type in U. S. National Museum, Washington. 
Ormenis Stal. 
In his recent work, Melichar has divided the old genus Ormenis 
into several genera. This would be good if his characters were 
more definite. In his table of the Cryptoflatini it is fairly diffi- 
cult to follow certain characters; as an instance, the one or two 
transverse lines formed by the apical and subapical cross-veins 
are not always easy to recognize, especially the subapical line, 
which is often irregular, and the cross-veins indistinct. In the 
present paper the writer has retained the old generic conception 
and added remarks as to where they appear to come in Meli- 
char’s new classification. He believes that a better system for 
both the Ricaniidae and Flatidae could be arrived at if more 
advantage was taken of the venation of tegmina. 
