NO. 2192. DRAOONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 533 

 OPHIOGOMPHUS SEVERUS MONTANUS (Selys). 



Male. — ^Entire face yellow, except the posterior third of the hori- 

 zontal siu-face of the frons. Vertex black. Occiput yellow. Rear 

 of head yellow, edged with black along dorsal border. (See fig. 186.) 



Prothorax black with an oval yellow spot on each side of posterior 

 lobe. 



Mesothorax and metathorax yellowish (green in life?), with the 

 following black markings : A broad niiddorsal stripe, twice as wide 

 below as above. Alar ridges black, the sinus pale. A narrow 

 sharply edged humeral stripe mdening to an oval in its upper half, 

 anterior to which is an oval spot which in some specimens is two-thirds 

 the length of the humeral suture. Mesinfraepistemum with a black 

 Une across its upper half. A black stripe curving caudad from the 

 lower end of the humeral stripe around the ventral end of the mese- 

 pimeron and rismg dorsad to terminate just anterior to the meta- 

 thoracic spiracle. Second lateral suture narrowly black, this con- 

 tinued ventrad around the upper side of the metinfraepistemum. 

 Coxae and femora pale (cream in life?); the dorsal surface of the fore 

 femora black; the apical half of the dorsal surface of the hind femora 

 black; the black on the middle femora intermediate in extent. 

 Tibiae black mth an external pale stripe. Tarsi black. Ptero- 

 stigmas brown. 



Abdomen colored as follows: 



Segment 1 yellow with a pair of dorsal black spots. 



Segments 2 — 10 with the dorsum black, each containing a mid- 

 dorsal roughly triangular yellow spot extending from the base to the 

 apical fourth; this spot on each seg-ment and shghtly constricted at 

 the vertical carinae with its broad end cephalad. Appendages yel- 

 low. Probably in hfe the side of segment 2 is yellow, of 3-6 white and 

 7-10 rich yellow. (See figs. 186-189.) 



Female. — Coloration identical with that of the male. (See figs. 

 190-191.) 



Measurements. — Male, abdomen, 35-37 mm.; hind wing, 30-31; 

 female, abdomen, 34-38 mm.; hind wing, 32. 



In the Cornell collection are four males and four females of an 

 OpMogomplms which has appendages similar to those of severus but 

 has a very dark coloration. The preceding description is based on 

 these, which bear the label "Y P.,* Aug." They also bear the label 

 montanus, having been identified by Prof. J. G. Needham. The 

 superior appendages of the male, while resembling those of severus 

 closely, are shghtly more bulbous at the apex, the inferior is shghtly 

 longer than in severus and the apex of the posterior hamule hardly as 

 truncate. Nevertheless, all these differences are so shght as to be 

 neghgible. 



1 Yeilowstoao Tark. 



