l68 ENTOMOLOGICAL NEWS. [April, 'l6 



tiimens the most remarkable venational character, in the light 

 of its probable relationship, is the relative position of the 

 arculus and the proximal angle of the subtriangle — in the 

 front wings the arculus is widely basal to the proximal angle, 

 and in the hind wings they are about on the same level (com- 

 pare with wing venation in the two species figured in this 

 paper.) This is the only reason I see for holding the generic 

 position of the species in doubt. It has the distal side of the 

 triangle of the front wing straight as described for C? 

 demerarac. 



Cyanogomphus conchinus* n. sp. (Plates viii, ix, figs. 1, 6-11). 



$. Abdomen 2,2. mm.; hind wing 23.5 mm. 



Face greenish brown, labrum slightly paler and clearer green, brown- 

 er at base, extreme lower edge black or dark brown; rhinarium 

 browner, the nasus again lighter and the f rons in front darker ; genae 

 brown. Frons above, vertex and occiput obscure reddish brown ; f rons 

 in-front shaded greenish; antennae black; transverse keel posterior to 

 lateral ocelli distinctly tri-lobed; occiput posteriorly straight, without a 

 posterior keel or edge, but rounded off, with short scarcely discernible 

 hair; occiput laterally on either side behind the eyes swollen as de- 

 scribed by Calvert (B. C. A.) for tumens (see note above under that 

 species). Rear of head reddish brown; labium dull yellow. 



Prothorax brown, markings if any obscure. 



Thorax robust ; above brown, on either side, starting at the antealar 

 sinus, an obscure bluish stripe reaching about two-thirds the distance 

 to the mesothoracic crest; its lower end just inside the upper end of a 

 short yellow stripe which extends down on to the mesothoracic crest ; 

 a bluish or greenish obscure mesothoracic half-collar, divided at the 

 middle and not joined, or if so very obscurely, with the yellow dorsal 

 stripe at either extremity. An indistinct narrow pale bluish ante- 

 humeral stripe which passes below on to the humeral suture; a very 

 narrow and more obscured posthumeral stripe of the same color. 

 Mesepimeron black or nearly so, obscurely pale yellow over a very re- 

 stricted area above, and more extensively and clearer posteriorly be- 

 low. Mesinfraepisternum nearly black, paler below. Metepisternum 

 similar to mesepimeron, but yellow below more extensive and clearer; 

 metinfraepisternum largely yellow, brown bordered. Metepimeron 

 broadly brown along the second lateral suture, except above where the 

 brown shades out into yellow which occupies the balance of the scler- 

 ite. Beneath pale yellow. 



* Referring to the shell-like first hamules. 



