SCUDDER ON FOSSIL INSECTS. 747 



allied to D. puhlpennis O, S,, bnt the absence of an}- piibesceuce at the 

 tip of the wing at once distinguishes it from the recent species. At 

 first, I supposed that it dififered from other species of Dicranomyia in the 

 absence of the auxiliary vein ; but, after careful study, a faint trace of its 

 apical portion was found in the same position relative to the origin of 

 tlie second longitudinal vein as in i). pHhqyennis ; as there, also, the first 

 longitudinal vein curves downward to, and terminates on, the second 

 longitudinal vein, directly opposite the cross-vein, uniting the discal 

 cell with the third longitudinal vein, instead of on thecosta; the sub- 

 costal cross-vein arises before the deflection of the first longitudinal, 

 runs parallel with it until it curves, when it turns in the opposite direc- 

 tion to the costa. The discal cell is closed, but the cross- vein separating 

 it from the second posterior cell is very faint, in which respect it agrees 

 better with other Bicranomym than with D. puhipennis. The stigma is 

 confined to that part of the space between the first and second longitud- 

 inal veins which lies beyond the origin of the third longitudinal veiu, 

 but it also extends upward to the costa; it is nearly circular and faintly 

 fuliginous. An oblique supernumerary vein runs obliquely to the centre 

 of the stigma from a point in the first longitudinal vein directly above 

 the origin of the third ; that is, from the inner edge of the stigma. The 

 outer and posterior margins of the wing are profuselj^ fringed with ver^- 

 delicate hairs, longer than the thickness of the stout costal vein. The 

 antenna? are fourteen-jointed, about twice as long as the head, the basal 

 Joints of the flagellumsubglobular, the others obovate, the apical one more 

 than twice as long as broad; they are delicately verticillate, the hairs 

 being but half as long as the width of the joints. The male anal lobes 

 are broadly obovate, deeply and abruptly excised externally at the base, 

 so as to leave a sharp right angle outwardly and a narrow peduncle on 

 the inner side. Together the lobes are broader than the tip of the abdo- 

 men, and each is about half as long again as broad. Length of body, 

 including the lobes, G.5"""; antenna' 1.2'"'"; wings 7.5; anal lobes of 

 male 0.55""". Fossil Canon. 



A second specimen of what is apparently the same species, judging 

 from the anal lobes, is somewhat stouter, but is destitute of all other 

 appendages, excepting indeterminate fragments of the rostrum, so that 

 no further knowledge of the species can be gained from it. The rostrum, 

 however, would seem to be scarcely longer than the head. Chagrin 

 Valley. 



In another specimen, also a male, the body, one of the wings, and 

 part of the legs of one side are preserved ; the whole is much fainter 

 than in the otiier specimens, but the auxiliary vein can be traced mid- 

 way between the costal and first longitudinal veins throughout nearly 

 its whole length. What is apparently the rostrum is a very little longer 

 than the basal joint of the antenuie, and a very little shorter than the 

 head. The character of the male appendices adds to the proof that this 

 belongs to the same species as those previously mentioned, but the 



