2m 



thoracic spiracles slightly elevated ; second annulus of segment with 

 indications of a dorsal plate ; remaining thoracic and abdominal seg- 

 ments without dorsal plates ; divisions between thoracic and abdomi- 

 nal segments distinct, the annuli very poorly defined ; surfaces of both 

 thoracic and abdominal segments densely covered with very short 

 pale hairs, the only distinguishable setulose hairs being on lateral mar- 

 gins of posterior annuli of segments. Apical abdominal segment tube- 

 like, chitinized but not conspicuously darker than preceding segments, 

 its length about 3 times as great as its greatest width ; apical papillae 

 very small, fringes short (Fig. 9). 



Pupa. — Length, 2 mm. Yellowish testaceous. 



Prothoracic organ (PI. XXXIX, Fig. 5) of moderate size, taper- 

 ing apically, and with a series of small spiracle-like protuberances 

 along one side; eyes large; antennae considerably thickened (male) ; 

 front view of head and appendages as in Figure 16. Abdominal ar- 

 mature weak ; dorsal segments, except basal, each with a transverse 

 posterior series of widely separated spinules and an interrupted medi- 

 an series of very minute setulae (Fig. 17) ; ventral segments (Fig. 

 18), except the apical one and those below wings, each with a posterior 

 and anterior transverse series of closely placed spinules and a median 

 transverse series of 4 rather widely placed spinules; apical segment 

 with 3 spines on each side, the two lower ones very closely placed; 

 apical thorns on upper margin strong (Fig. 1). 



The above descriptions were drawn from larvae and pupae ob- 

 tained from cow dung in November. 191 5, and April, 191 6, the for- 

 mer at Urbana and the latter at White Heath, 111. 



The small size of this species makes it a very difficult one to rear 

 and isolate the stages and exuvia successfully. 



Originally described from Sea Cliff, N. Y., and subsequently re- 

 corded from Mesilla, N. Mex. Probably of general occurrence 

 throughout North America. 



Psychoda superba Banks 



Psychoda superla Banks, Can. Ent,, Vol. 26, 1894, p. 332. 



Larva (PI. XXXIX, Fig. 13).— Length, 5-5.5 mm. Grayish 

 white; head, chitinized dorsal plates, and apical segment brown. 



Dorsal surface of head with several long hairs; antenna termi- 

 nating in 2 stout bristles and 2 weak hairs (Fig. 12). All thoracic 

 and abdominal segments with a single large chitinized plate on dorsum 

 of each annulus, those of prothoracic and first mesothoracic annuli 



