H^QEj,.] ZOOLOGY PSEUDO-NEUKOPTEEA AND NEUEOPTEEA. 591 



arctica,''^ are to be struck out, as tbis appearance was due to some dirt 

 which stuck to the appendages of the typical specimen. The male type 

 and the pair from Vancouver's Island are hirger, most of the Colorado 

 specimens show smaller dimensions, and differ as stated above by the 

 abdomen being black, without fulvous basal spots on segments 4-8 ; 

 this may be due, perhaps, to the action of the alcohol or of some sub- 

 stance added to the alcohol for the better ijreservation of the specimens. 

 The difference of U.forcipata is no longer doubtful after the examination 

 of more specimens, but this species is very nearly related, and differs by 

 the labrum having a brownish spot on each side, by the anterior femora 

 being partly fulvous, by the appendages of the male ; the vulvar lamina 

 of the female is the same, split on the apex. Having now carefully com- 

 pared U. arctica of Europe with both species, I am very sure of the spe- 

 cific difference of this species. In E. arctica, the split at the apex and 

 the appendages of the male are different. 



Subfamily J^SCHNINA. 



^SCHNA. 



^. consiricta, Hagen, Synop., 123, 8 (Hayden's Eeport, 1872, 727). 



Hahitat. — Yellowstone, common (0. Thomas) ; foot-hills, Colorado, a 

 male without head. This species is common everywhere east of the 

 Mississippi from Canada to Maryland and west to Wisconsin and 

 British Columbia. 



^. multicolor, Hagen, Synop., 121, 4 (Hayden's Eeport, 1872, 727). 



Habitat — Yellowstone (C.Thomas) ; Vancouver's Island (Mr. Crotch); 

 Upper Missouri, Pecos Eiver, Western Texas, and Cordova, Mexico. 

 A decidedly western species. 



^. proinnqua, Hayden's Eeport, 727. 



Habitat. — Yellowstone, fragments of the male and female ; Colorado 

 plains, June 25 to July 5, female. The speciuiens are not in good condi- 

 tion, but 1 believe them to belong to the species described by Mr. 

 Scudder from the White Mountains, New Hampshire. In the report of 

 1872, I did mention one female of the ^. eremitica from Yellowstone; 

 perhaps this female belongs also to ^. propinqua. 



Subfamily GOMPHINA. 



OPHIOGOMPHUS. 



0. severus, sp. nov. 



Greenish -yellow ; head and mouth i)arts greenish-yellow, labium and 

 labrum paler ; antennae black ; part between the eyes black, forming a 

 transverse black band above the base of the front, excised in the mid- 

 dle 5 vertex greenish-yellow, flat, the front margin deeply notched, the 

 sides of the vertex cariniform, curved in an exact semicircle around 

 the lateral ocelli; occiput greenish-yellow, straight, fringed with black 

 hairs, a small rounded inflation in the middle of the front side ; eyes 

 behind greenish-yellow, with a small, black band along the superior 

 border, beginning near the occiput. Thorax greenish-yellow, an ill- 

 defined, brownish spot on the dorsum each side near the wings ; the 

 crest of the sinus not exceeding the bifurcation, black, and an incom- 

 plete blackish band on the humeral suture beginning at the wings. 



(Three males and two females from Colorado, in alcohol; a single male 



