■ — Ventral abdominal segments without median sucker-like disc; 

 thoracic segments without chitinized plates, or if these are present 

 they are not noticeably larger than those on the following seg- 

 ments 2 



2. Apical abdominal segment short and stout, with 4 small protuber- 

 ances w^hich are fringed with soft hairs Pericoma*. 



— Apical abdominal segment usually conspicuously elongated, in the 



form of a chitinized tube ; apical protuberances and fringes short 

 Psjjcliocla*. 



PUPAE 



1. Pupa flattened, about twice as long as broad, oval in outline, the 

 abdomen laterally not narrower than the thorax, without spines, 

 apical segment rounded Maurina {Pericoma) calif orniensis. 



— Pupa not flattened, more than 3 times as long as greatest breadth, 



abdomen well differentiated from thorax and with transverse 



series of spines, apical segment not rounded 



Pericoma and Psyclioda]. 



Maurina (Pericoma) cauforniexsis Kellogg 



Fericoma californiensis Kellogg, Ent. News, Vol. 12, 1901, p. 46. Larva and 



pupa. 

 Pericoma californica Kincaid, Ent. News, Vol. 12, 1901, p. 195. Imago. 



The above synonymy is the reverse of that given in Aldrich's Cata- 

 logue, but must be accepted because of the following facts. It is suf- 

 ficient for the purpose of identifying a species that either the larval 

 or pupal stage be accurately or recognizably described ; Kellogg de- 

 scribed and figured both larva and pupa and described the habits of 

 the species in February, whereas the description of the adult by Kin- 

 caid did not appear until the following September. The fact that Kel- 

 logg gives Kincaid as authority for the name californica in the legend 

 to his figures of larva and pupa does not alter the status of californien- 

 sis, for Kincaid's name, californica, had no standing ilntil published 

 by him in September ; and that he was in no way responsible for either 

 Kellogg's descriptions or figures seems evident from the absence of 

 acknowledgment to that effect in Kellogg's paper. 



*The last two genera are separated by the use of characters that appear to 

 apply very well to the groups as far as they are known, but within the composite 

 genus Psychoda there are larvae that differ in such degree as to warrant their fur- 

 ther subdivision. 



fl know of no reliable characters that can be used in the separation of the 

 pupae of Pericoma and Psychoda. My material is confined to the latter, a key to 

 part of which is given herewith. 



