271 



rangemcnt of the hiiirs both on the dorsal plates and on the ventral 

 surface, and also in the form of the apical segment. There are no 

 outstanding differences in the pupae of the two species. 



PsYCHODA DOMESTIC A Haseman 



Psychoda domcsiica Haseman, Kiit. News, Vol. 19, 1908, p. 282. 



The immature stages of this species were described by Haseman. 

 I suspect that the species is a synonym of cincrca Banks. The only 

 difference between the larva described by Haseman and that de- 

 scribed as cinerca in the present paper lies in the absence of the small 

 plates on the basal abdominal segment in doniestica. These are dif- 

 ficult to see in fresh material, and may have been overlooked by Hase- 

 man. 



Described from specimens obtained from plant cultures in a lal'- 

 oratory at Columbia, Mo. 



Psychoda cinerEa Banks 



Psychoda cinerea Banks, Can. Ent., Vol. 26, 1894, p. 330. 



Larva (PI. XXXIX, Fig. ii).— Length, 4.75-6 mm. Whitish 

 testaceous, the head, chitinized plates on dorsum, and the apical seg- 

 ment fuscous brown. 



Head posteriorly sinuous in outline above, 2 small, narrow, dark 

 plates on the membrane posterior to the central concavity. Thoracic 

 segments each with 2 chitinized dorsal plates ; prothoracic annuli each 

 with 2 hairs on each side just in front of the outer half of the plates, 

 these hairs being duplicated in the second annulus, each pair consist- 

 ing of 2 hairs on a single base; second and third thoracic segments 

 with similar hairs on posterior annuli, the anterior annuli without 

 them; respiratory organ of moderate size, protruded. Basal abdomi- 

 nal segment biannulate. each annulus with a very small dorsal plate ; 

 following segments triannulate, the size of the dorsal plates on the 

 anterior segments small, increasing posteriorly until on the last an- 

 nulus of seventh segment the plate covers one half of the dorsal area ; 

 posterior annuli of all segments with a pair of duplicated hairs on 

 each side, the other segments without long hairs; lateral margins of 

 each of the posterior annuH with 2-3 long hairs; apical abdominal 

 segment long and tapering, the terminal appendages small and slen- 

 der; ventral segments each with a pair of long hairs on each side of 

 the posterior annuli, the discal hairs, especially on middle of annuli, 

 much longer and stronger than on dorsum, their apices bifid or trifid. 



