70 Clarence E. Mickel 
Trypoxylon rufozonale Fox. 
1891. Trypoxylon rufozonalis Fox, Trans. Amer. Ent. Soc., XVIII, 
p. 145. 
1893. Trypoxylon rufozonale Fox, Proc. Acad.-~Nat. Sc. Phil., p. 475. 
Males 3, females 4: Glen (2) and Monroe Canyon (5) ; August 
3 to August 20. 
Try poxylon texense Saussure. 
1867. Trypoxylon texense Saussure, Reis d. Novara, Zoil., II, Hym., 
Dp. 77. 
1877. Trypoxylon sulcus La Munyon, Proc. Nebr. Assoc. Adv. Sc., 
March, 1877. 
1893. Trypoxylon texense Fox, Proc. Acad. Nat. Sc. Phil., p. 475. 
Males 3: Culbertson (2), August 20, 1889 (F. C. Kenyon), 
and Glen (1), August 14, 1906. 
The type of Trypoxylon sulcus La Munyon is lost, but that 
species is evidently the same as texense and should be consid- 
ered synonymous. 
Trypoxylon johnsoni Fox. 
1891. Trypoxylon Johnsoni Fox, Trans. Amer. Ent. Soc., XVIII, p. 
147. 
1893. Trypoxylon Johnsonii Fox, Proc. Acad. Nat. Sc. Phil., p. 475. 
Females 1: Omaha, August 17, 1914 (L. T. Williams). 
Trypoxylon fastigium Fox. 
1891. Trypoxylon carinifrons Fox, Trans. Amer. Ent. Soc., XVIII, 
p. 142. 
1893. Trypoxylon fastigium Fox, Proc. Acad. Nat. Sc. Phil., p. 476. 
1908. Trypoxylon frigidium H. S. Smith (nec F. Smith), Univ. 
Nese. Stupies, VIII, p. 352. 
Males 1, females 1: Omaha (1), July 25, ro14 (LT. Wao 
liams); and Glen (1), Augusts3, 1906°(H S.jsmtk ). 
MELLININAE © 
KEY TO THE GENERA 
Cubitus in hind wings originating beyond the transverse median nervure; 
*front wings with the second cubital cell receiving both recurrent ner- 
Bitl a eee aA 8 Sameera ort OGM Oe somber noe ta Hhoduc Mellinogastra 
Cubitus in hind wings interstitial with the transverse median nervure; 
second cubital cell receiving both recurrent nervures; enclosure of 
middle ‘segmenit striated: j.\ituncte tog <o.- certs sii encreietoieminr es Hypomellinus 
