267 



The generic name Maurina was first used by Miiller for a group 

 of 3 species found by him in southern Brazil in situations similar to 

 those in which californiensis occurs — rather swift running water*. 

 The larvae agree with the larva of californiensis and differ from 

 others belonging to Pericoma in having a medio-ventral series of 

 sucker-like discs, one on each abdominal segment except the last, and 

 the pupae, with their oval shape and flat appearance, conform to the 

 same grouping. Eaton has subdivided the genus Pericoma into sev- 

 eral genera, but upon adult characters only. 



I have not seen any stage of californiensis, no suitable situations 

 for its occurrence being in this part of the state. 



The wing venation of the imago as figured by Kincaid differs 

 from that of the normal Pericoma, and in the absence of the base of 

 the anterior branch of the posterior furcate vein resembles that given 

 by Miiller for the Brazilian species. 



PsYCHODA Meigen 

 Keys to Species 



LARVAE 



1. Thorax without well-defined ehitinized transverse plates 2 



— Thorax with well-defined ehitinized plates 6 



2. Abdomen without ehitinized dorsal plates minufa. 



— At least sixth and seventh segments with ehitinized dorsal plates. .3 



3. Sixth and seventh abdominal segments each with 3 ehitinized trans- 



verse dorsal plates 4 



— Fifth, sixth, and seventh abdominal segments with ehitinized trans- 



verse dorsal plates 5 



4. Thoracic and abdominal segments, except sixth and seventh, each 



with a closely approximated pair of hairs on a small circular plate 

 near the posterior lateral ma^rgin nocturnala. 



— Thoracic and abdominal segments without such hairsf . . . .scJiizura. 



5. Fifth, sixth, and seventh abdominal segments each with 3 ehitinized 



transverse dorsal plates albimaculata. 



— Fifth and sixth abdominal segments each with 3 ehitinized trans- 



verse dorsal plates, seventh with 2 floridica. 



6. Prothoracic segment with one ehitinized plate, metathoracic seg- 



ment with 2 such plates ; abdominal segments, except 6 and 7, 

 without ehitinized plates alternata. 



— Each thoracic and abdominal segment with a ehitinized plate on 



each annulus 7 



*Trans. Ent. Soc. London, 1895, p. 480. 



t Neither mentioned in description nor drawn in figures by Fullaway, so assumed 

 to be absent. 



