20 Harry Scott Smith 
Two females, West Point, June (H. S. Smith). These speci- 
mens have the pygidium red and the tubercles yellow, characters 
not mentioned by Fox in his original description of the species. 
It may prove to be distinct. With the exception of the metanotal 
sculpture this is very much like the male of the above species. 
Alyson melleus Say. 
1837. Alyson melleus Say, Boston Journal of Natural History, i, p. 
380. 
1859. Alyson melleus Say, Leconte edition, ii, p. 762. 
1894. Alyson melleus Fox, Entomological News, v, p. 77. 
Three females, Glen during August, and West Point during 
June (H. S. Smith). Readily distinguished by its being almost 
entirely ferruginous. 
Genus Didineis Wesmael 
Didineis texana (Cresson). 
1872. Alyson texanus Cresson, Transactions of the American Ento- 
mological Society, iv, p. 226. 
1894. Didineis texana Fox, Entomological News, v, p. 127. 
A single male of this insect was taken at Lincoln, on Septem- 
ber 8, 1899. This species may be separated from the others 
known from North America by the cylindrical, not nodose, joints 
of the flagellum in the male, and the black head and thorax in the 
female. 
Subfamily GORYTINAE 
KEY TO THE GENERA 
Cubitus in hind wings interstitial or originating only a little before 
the transverse median nervure. 
Cubitus in the hind wings interstitial; triangular area of metanotum 
not sharply defined, but striate or coarsely rugose.......... Hoplisoides 
Cubitus in hind wings most frequently originating a little before the 
transverse median nervure; triangular area of metanotum always 
well defined, the enclosure always longitudinally striate...... Hoplisus 
Cubitus in hind wings originating far before the transverse median 
nervure; triangular area of metanotum sharply defined by grooved 
lines, the enclosure smooth, polished, not striate, or at most only 
slightly’ striate: laterally at base.-:.ecica0e. cates ccs relia Pseudoplisus 
342 
