MAY FLIES AND MIDGKS Ol- NEW YOPaC 1<5 



the base The kibim.i (1) has atoout 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, ihe 

 thoracic and anal feet are of the usual (J h 1 r o n o ni u s type. 

 The dorsal tuft of the anal segment is present; blood gills of the 

 eleventh segment absent. 



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

 tinoe IMioracic respiratory organs apparently wanting. On the 

 doisal ].osterior margins of each of the abdominal segments ex- 

 cep ino the tirst and last, there are 10 to 12 short, s out caudad 

 Z ec-ting teeth, the two or three lying nearest the latei-al mar- 

 l^n'be ng^maller 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 lilameivt. wkidi 

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



'''^ lulL^pupa'^^-eatlv reseiubles that of P. c u 1 i c o i d e s as de- 

 seabed bvW^ (1853) excepting that there are eight abdominal 

 filaments in the latter while there are but six m the ±oimei. 



Described from specimens taken in Oascadilla creek, Ithaca 

 N Y An emptv pupal skin from Las Vegas, 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 t^v'ic^ ^^^ J^^f /?,' 

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

 longer than all the rest taken together. The palpi are some^ha 

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

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

 ^^0. Dorsum of the thorax black, subshining, with a faint cin- 

 ereous bloom covering the surface, excepting the three slight, 

 raised longitudinal stripes, wiiich are deep black, and between 

 which are arranged some scattered black setae; scutellum daik 

 brown with bhu^k setae; metanotum and pleura black, the latter 

 ^ith a gray bloom; abdomen black, longer than the wings m 

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

 gins of\he segments narrowly cinereous. Genitaha conspicuoiis 

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

 pendages triangular in outline with a sharp point; the basal 

 S with a poTnted 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. If^^^Jl^W 

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



