74 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



272 



273 



Fig. 272. — Psycho7nyiid Genus A, larva, head. 

 Fig. 273. — Psychomyiid Genus B, larva, head. 



those in fig. 201 ; anal hooks with inner teeth 

 minute, fig. 190. 



Adults. — Unknown. 



This curious larva has been taken in small 

 to medium-sized, rapid streams, including 

 the Salt Fork River and Rock Creek. Only 

 scattered records are available, a few in 

 the northern half of Illinois, and others 

 from Florida, Michigan and Wisconsin. No 

 accurate statement can be made as to the 

 identity of this larva, but it is probably one 

 of those now known only from the adult 

 stage, such as Nyctiophylax, Cyrnellus or 

 Cernotina (see the following). 



Illinois Records. — Bartelso: Aug. 16, 

 1898, on logs, C. A. Hart, 1 larva. Erie, 

 Rock Creek: June 5, 1940, Mohr & Burks, 

 1 larva. Oakwood: June 6, 1920, T. H. 

 Frison, 2 larvae. 



pronotum brown with anterior margin yel- 

 low; legs cream to white. General struc- 

 ture of mandibles and legs similar to above, 

 fig. 274; ninth sternite bearing a T-shaped, 

 reticulate area and having tubular processes 

 of tenth segment short, with an extensive 

 patch of minute spinules, figs. 200, 201. 



Adults. — Unknown. 



We collected a single specimen of this 

 larva in rapids of the Kankakee River at 

 Momence, Illinois, May 26, 1936, H. H. 

 Ross. The similar mandibles and anal hooks 

 show a marked affinity with the larva de- 

 scribed above as Genus A ; they will doubt- 

 less prove to be Nyctiophylax, Cyrnellus or 

 Cernotina. 



hype McLachlan 



Lype McLachlan (1879, p. 422). Genotype, 

 here designated: Lype phaeopa (Stephens). 



To date only one species of the genus 

 has been recorded for North America. We 

 have one record of it from Illinois. 



In recent years there has been consider- 

 able juggling of generic names in this com- 

 plex. I believe that the genital structures 

 indicate clearly that Betten's (1934) defini- 

 tion of this and the following genus is 

 correct. 



Larvae of this genus are not available for 

 study. The genotype has been reared in 

 Europe, but no North American species 

 have had the adults and larvae associated. 



Psychomyiid Genus B 



Larva. — Fig. 273. Length 8 mm. Head 

 creamy yellow with a large brown mark 

 covering most of anterior portion of dorsum; 



Neureclipsis 

 crepuscularis 



PSYCHOMYIA 

 FLAVIDA 



Fig. 274. — Psychomyiidae larvae, legs. I, 

 front leg; II, middle leg; III, hind leg. 



Lype diverse (Banks) 



Psychomyia diversa Banks (1914, p. 253); cf. 

 Lype griselda Betten (1934, p. 229); cf. 

 New synonymy. 



Adults. — Length 5-7 mm. General color 

 very dark, almost black, with only a few 

 irregular light marks along the sutures. 

 Male genitalia, fig. 275: tenth tergite large 

 and hood shaped, with a dorsal horn; cerci 

 long and lanceolate; claspers long and nar- 

 row; aedeagus arcuate. Female genitalia, 

 fig. 276, produced into a long, tapering ovi- 

 positor, without conspicuous processes. 



Allotype, female. — Elkmont, Tennessee, 

 along Little River: June 12, 1938, T. H. 

 Frison & T. H. Frison, Jr. 



The dorsal horn of the male tenth ter- 

 gite varies conspicuously from a very short, 

 sharp projection to a long,' sinuate structure 

 enlarged at the tip. The type of diversa 



