594 GEOLOGICAL SUEVEY OF THE TERRITORIES. 



0. rupinsulensis. 



Hei'petogomphus rupinsulensis, Walsbi, Acad. Nat. Sci. Phil., 1862, p. 388, male. 

 Proc. Ent. Soc. PMl., 1863, p. 253. 



Male. — Greenish-yellow ; labium pale-livid (blue, Walsh), black on 

 the anterior margin and the fore half of the side ; lateral lobes pale ; lab- 

 rum pale, with a fuscous basal spot, but little marked on each side } head 

 in front greenish-yellow ; antennsB black, apical border of the first joint 

 pale ; part between the eyes and front black ; the extreme base of the 

 front between the antennae black ; vertex greenish-yellow, casiniform, 

 excavated above, scarcely emarginate, the sides rounded off at the ends, 

 and a smaller carina in a semicircle around the ocelli ; occiput straight, 

 scarcely elevated in the middle, yellow, densely ciliated with long, 

 black hairs ; eyes livid behind, paler beneath, with a blackish su- 

 perior spot near the occiput. Thorax greenish-yellow, the meso- 

 thoracic crest black just where it bifurcates, and on the end of 

 the sinus near the wings ; a brownish band only indicated on each 

 side near the humeral suture, not reaching the wings ; a small brown 

 band on the humeral suture; thorax otherwise immaculate except 

 some brownish spots near the feet to the stigma. The colors of 

 the abdomen not well preserved (pale-brown, clouded with brown, 

 Walsh) ; on the dorsum of the segments a lanceolate, yellowish spot, two 

 black apical spots, and two small transversal lines in the middle ; last 

 segment yellowish, rounded ; ventral margins of the segments yellowish ; 

 venter black, on the four last segments rufous ; the abdomen slender, 

 cylindrical, somewhat dilated at the base and much more on segments 

 7-8; appendages greenish-yellow, with long, pale, dense hairs; superi- 

 ors about as long as the last segment, very robust, directed downward, 

 approximate at base, conical, a little bent, obtuse at tip, interiorly with 

 a small basal tooth ; viewed laterally, with an inferior carina, iiquarelj 

 truncate on tip, and on the terminal half below three irregular rows of 

 small, short, black teeth ; inferior about as long and exactly attaining 

 the lower angle of the truncated tips of the superiors, broad, bifid ov 

 the apical half, viewed from below and each branch very robus; 

 rounded, divaricate, squarely truncate on tip, viewed laterly strongly 

 incurved, incrassate at base and still more so on tip, which is truncate : 

 genital parts on the second segment with the first hamule black, with a 

 deep, posterior, elliptic excision on tip, the superior angle forming a 

 long, sharp, incurved hook, nearly meeting the opposite angle ; thf 

 second hamule longer, the basal half thick, pale, cylindrical, the apical 

 half suddenly thinner, black, cylindrical, incurved, and again recurved 

 on tip ; sheath of the penis hollowed, four-lobed, the two interior lobeg 

 divergent, short, conical, the outer lobes large, rounded on the margin ; 

 penis with two small, black, short, irjcurved spines on tip, and with an 

 inferior tooth on the second joint; earlets yellowish-green, rounded, 

 some small black spines on the inner angle ; feet yellowish-green, 

 femora with a broad, brown, anterior band, only near the knee on the 

 four posterior feet, which are more brownish beneath ; tibiae black, with 

 a superior yellow band ; tarsi black, on the posterior pair yellow in pan 

 above; wings hyaline, slightly flavescent at base; veins black, the 

 costa yellow ; pterostigma brown, oblong, surmounting about five cells ; 

 membranula cinereous; autecubitals, 13-14; postcubitals, 9-12 ; two 

 discoidal areolets. , 



Female. — Similar to the male. Occiput similar, but each side on the 

 border nearer to the eye a short, small, cylindrical, yellow spine, smooth 

 on the tip; a second female has the spine rudimentary; in a third speci- 

 men there is none ; behind the eyes, each side, near the occiput, a brown, 



