CRYPTOLABIS. 185 



vein aiKl the tip of tlie anterior branch of the second is distinctly 

 shorter than the distance between the tips of both branches 

 of the second vein ; third and fourth veins somewhat con- 

 verging ; discal cell open, confluent with the second posterior 

 cell (for more details about the venation compare the generic 

 characters). 



Hab. Trenton Falls, N. Y. A male specimen ; another one, 

 which is injured, has only the thorax and the wings left. 



Gen. XXV. CRYPTOLABIS. 



Two submarginal cells ; the inner marginal cell is short and almost tri- 

 angular (Tab. II, fig. 11), owing to the shortness and the very oblique course 

 of the praefurca ; the origin of the latter is a little beyond the middle of 

 the length of the wing ; four posterior cells ; discal cell open ; the posterior 

 branch of the fourth longitudinal vein is forked. Wings glabrous, except 

 an almost microscopic pubescence in the apical portion of the wing. An- 

 tennae 16-jointed. Tibice without spurs at the tip; empodia distinct. 

 Forceps of the male with very small horny appendages ; ovipositor of the 

 female without any apparent horny valves. 



The body is short and stout ; the antenna;, if extended back- 

 wards, would not quite reach the root of the wing; joints of the 

 flagellum oval, with rather long, verticillate hairs. Rostrum 

 short ; palpi with subcylindrical joints of nearly equal length. 

 Feet rather short and stout, strongly pubescent ; those of the 

 intermediate pair much shorter than the hind ones ; tibise slightly 

 incrassated towards the tip ; ungues very small ; empodia distinct. 

 Thoracic suture distinct. Wings (Tab. II, fig. 11) comparatively 

 short and broad ; the auxiliary vein ends a little beyond the origin 

 of the second longitudinal vein ; the rather indistinct subcostal 

 cross-vein is at a distance from the tip of the auxiliary vein, which 

 is equal to about one and a half the length of the great cross-vein ; 

 owing to the shortness of the praefurca, the subcostal cross-vein 

 is a little anterior to the origin of the latter; the branches of the 

 second vein and the third vein are straight, the two latter nearly 

 parallel ; the veins separating the first, second, and third posterior 

 cells are gently arcuated ; the second submarginal cell is equal in 

 length to the first posterior cell ; the discal cell being open, coa- 

 lesces with the second posterior cell. The inner marginal cell 

 (included between the praifurca and the marginal cross-vein) is 

 not elongated, as usual, but has the shape of an almost equilateral 



