NORTH AMERICAN NEUROPTERA. 259 



8. Ophiogoiiipliiis severus (raised). 

 Hagen, Hayden Eep. IST-'!, p. 591. 



Three nympliae in alcohol from Colorado, one full grown, by Mr, 

 Hayden, one very young by Mr. Carpenter ; seven skins of both sexes 

 from Umatilla, Oregon, June 25, and Weeksville, Mont., Aug. 2, 1882, 

 by Mr. S. Heushaw. Length 27 to 29 mm. ; young, 11 mm. 



Head cordate, eyes prominent; body hairy, less on the abdomen; antennse 

 short ; third joint less than thrice the length of the two basal ones, flat, concave 

 above, enlarged after base, but not to the tip, which is rounded ; fourth joint very 

 short and thin, conical; mask as 0. colubrinus; wing cases covering nearly 4th 

 segment; abdomen half as broad as long, tapering on tip, somewhat flattened; 

 segments of equal length, the 10th shorter; lateral spines short, on segments 7 to 

 !l ; dorsal hooks on segments 2 to 9 stronger and more exserted on segments 2 to 4 ; 

 scars as usual; female genitals two small yellowish knobs; appendages less than 

 twice the length of last segment, triangular, jointed, the laterals a little shorter; 

 legs slender, somewhat longer than in 0. coluhrinvs, third joint of posterior tarsi as 

 long as the two basal ones. 



The young nympha entirely similar, but the wing cases covering only the 2d 

 segment. 



We caught the teneral imago near the skin, and as the 0. occidentis 

 flying at the same time and place has been actually taken during trans- 

 formation, the statement " raised" seems justified, the more as the identity 

 of the nympha is proved by the specimens from Colorado, where no 

 other Ophiogomphus but 0. severus has been observed. 



9. Ophi4>gom|»liii$« occidentis (raised). 

 Hagen, no v. spec. 



Ten nympha skins of botli sexes from Umatilla, Oregon, June 25th, 

 Big Bend of Yakima River, Washington Territory, July 19, 1882, by 

 Mr. S. Henshaw ; full grown nympha in alcohol from Washington Ter- 

 ritory opposite Umatilla June 27, 1882, by H. Hagen. Length 28 mm. 



Very similar to 0. severun ; differs by lateral spines on segments 6 to 9 ; dorsal 

 hooks all strongly erected, the last two with the tip bent backwards; a black dot 

 on each side of the dorsal hooks and a row of ill defined spots more externally ; 

 lateral appendages one-third shorter than the middle one; third joint of posterior 

 tarsi somewhat longer than the two basal ones. 



This is the species of which I have given in " Nature" (No. 686, vol. 

 27, Dec. 21, 1882, p. 173) some notes concerning its tracks on the sand 

 when ready for transformation into the imago state. 



10. ? Opiiiogoinphias spec (supposition). 



Six nymphse, not full grown, in alcohol, from the Sutledge River above 

 Billespur, Himalaya, by Rev. M. M. Carleton, 1872. Length 23 to 

 20 mm. 



