MAY FLIES AND MIDGES OF NEW YORK 175 



the base. The laibium (1) has aibout 19 blunt teeth; the antennae 

 are of moderate length, bare, and with three terminal append- 

 ages. The entire body appears to be devoid of hairs. The 

 thoracic and anal feet are of the usual Ohironomus type. 

 The dorsal tuft of the anal segment is j)resent ; blood gills of the 

 eleventh segment absent. 



Pupa. The pupa is fuscous in color, with a slightly greenish 

 tinge. Thoracic respiratory organs apparently wanting. On the 

 dorsal posterior margins of each of the abdominal segments, ex- 

 cepting the first and last, there are 10 to 12 short, stout caudad 

 projecting teeth, the two or three lying nearest the lateral mar- 

 gin being smaller than those near the median line; and on the 

 ventral surface of the segments, excepting the first, second and 

 last, there are six or eight stout teeth projecting cephalad. At 

 the anal end there are three pairs of short hollow filaments which 

 may have a respiratory function. The lengtli of pupal life is 

 about two days. 



This pupa greatly resemibles that of D. c u 1 i c o i d e s as de- 

 scribed by Heeger (1853) excepting that there are eight abdominal 

 filaments in the latter while there are but six in the former. 



Described from specimens taken in Oascadilla creek, Ithaca, 

 N. Y. An empty pupal skin from Las Yegas, New Mexico, from 

 Professor Cockerell does not differ from the one described above. 



Male. Black; head black, including eyes, mouth parts and 

 antennae, the latter densely covered with long, dark brown hair. 

 Its first joint enlarged, disk-like, the second twice as long as 

 broad, the following 11 a little shorter than broad, the 14th 

 longer than all the rest taken together. The palpi are somewhat 

 shorter than the antennae, four-jointed (besides a small basal 

 piece), the first joint shorter, the fourth longer than the other 

 two. Dorsum of the thorax black, subshining, with a faint cin- 

 ereous bloom covering the surface, excepting the three slightly 

 raised longitudinal stripes, which are deep black, and between 

 which are arranged some scattered black setae; scutellum dark 

 brown, with black setae ; metanotum and pleura black, the latter 

 with a gray bloom; abdomen black, longer than the wings in 

 fresh specimens, covered with fine brown hairs, posterior mar- 

 gins of the segments narrowly cinereous. Genitalia conspicuous 

 and rather complex (pl.32, fig.l4) ; the apical joint of the ap- 

 pendages triangular in outline with a sharp point; the basal 

 joint with a pointed process attached near its base on the inner 

 side, mesad of which are two smaller pointed projections. The 

 dorsal keel is nearly straight and spike-like. Legs uniformly 

 fuscous, all the fourth tarsal joints shorter than the fifth, tarsal 



