30 Clarence E. Mickel 
Females 11: Omaha (6), Lincoln (1), West Point (2), Mas- 
kell (1) and Glen (1) ; June 26 to August 18. 
Alyson oppositus Say. 
1837. Alyson oppositus Say, Bost. Journ. Nat. Hist., I, p. 380. 
1894. Alyson oppositus Fox, Ent. News, V, p. 87. 
Females 5: Omaha (1), Mitchell (1), Monroe Canyon (2) and | 
Glen (1) ; August 6 to August 19. 
Alyson radiatus Fox. 
1894. Alyson radiatus Fox, Ent. News, V, p. 87. 
1908. Alyson radiatus H. S. Smith, Univ. Nepr. Stupies, VIII, p. 341. 
Females 2: West Point; June. 
Alyson conicus Provancher. 
1887. Alyson conicus Provancher, Additions a la Faune du Canada, 
Hymen., p. 271. 
1894. Alyson conicus Fox, Ent. News, V, p. 88. 
Males 4: Monroe Canyon, August 3, 1908 (R. W. Dawson). 
Didineis Wesmael 
Didineis texana (Cresson). 
1872. Alyson texanus Cresson, Trans. Amer. Ent. Soc., IV, p. 226. 
1894. Didineis texana Fox, Ent. News, V, p. 127. 
Males 1, females 1: Lincoln (1), September 8, 1899; Mitchell 
(1), September 6, 1916. 
NyssoNnini 
KEY TO THE GENERA 
1. Cubitus in hind wings originating before the transverse median nervure 
or interstitial with it; hind tibiae usually spinous, but not serrate on 
hind margin; scutellum normal; apex of abdomen of male termi- 
Hating: dm LW: Leet ss, valet ene Os ieee eee eee ee teers Nysson 
Cubitus in hind wings originating beyond the transverse median 
GLOV WHALES 15.0.2 5 wane, Ds: di Saas ene ee bro Ree ee on ence ee 2 
2. Hind tibiae strongly serrated on the hind margin, and also more or less 
spinous; lateral margins of scutellum more or less strongly reflexed, 
the metanotum bilobed; apex of male abdomen terminating in four 
LOGE 5% Se a aise cna Deets eee UL oO Ee LL eee Paranysson 
Hind tibiae with feeble spines, never serrate; lateral margins of scu- 
tellum more or less margined, the metanotum normal; apex of 
abdomen of male terminating in two teeth ........... Brachystegus 
348 
