CHIRONOMID MIDGES OF CALIFORNIA — SUBLETTE 129 



The specimen apparently got wet; the wings were crumpled, with 

 the result that, when a slide preparation was made, the membrane 

 was rubbed as it was flattened under the cover slip; however, there 

 appear to be the alveoli of sparse macrotrichia near the wing tips. 

 Cross vein m-cu narrowly separated from r-m. 



This species may be recognized by its genitalia, which is similar to 

 Pseudodiamesa pertinax (Garrett) and P. branicki (Nowicki), but 

 which has an anal point more slender than either of the two, and in 

 which tlie basal lobe of the basis tyle extends more distally. The 

 dististyle with its spine hidden from a dorsal view appears also to be 

 distinctive; however, this may be the result of a slide-mounting 

 variation. 



Allotype: In USNM: Topotypic, Apr. 12, 1953, H. L. Mathis. 



Similar to male in coloration and most body features except that 

 second palpus segment longer than first, to which fused; second seg- 

 ment with distinct swelling. Genital plates lamellate with virtually 

 no ventral elongation. Fourth tarsal segments shortened but not 

 distinctly obcordate. 



Prodiamesa {Monodiamesa) species 



There is only one North American record of the subgenus, namely, 

 Prodiamesa (Monodiamesa) bathyphilia Kieffer, an identification based 

 on a larva. Brundin (1951) questions the identity of this North 

 American material. The female at hand will not resolve the ques- 

 tion raised by him as only males can be specifically identified with 

 certainty. I believe this specimen to represent a new species but 

 have not so named it because of lack of definitive characteristics in 

 the female. To my knowledge this is the first North American record 

 of the subgenus based on adults. 



Material examined: In UCLA: 1 female, Whitmore Tub, Mono Co., 

 Aug. 3, 1952, McDonald. 



Dianiesa fulva Johannsen? 



Diamesa fulva Johannsen, Ent. News, vol. 32, p. 229, 1921. 



Head yellowish; antennal pedicel yellow, flagellum black. Eyes 

 without dorsal extension, glabrous. Palpi black; second segment 

 without swelling; subcylindrical. 



Prothorax infuscate yellow. Mesonotum and scutellum pale cin- 

 namon brown; vittae not distinct; overlaid with white pollen. Scutel- 

 lum rounded above; apex not pointed; postnotum blackish-brown; 

 sternopleuron yellowish, somewhat darker on sternum; halteres white. 



Fore coxa, trochanter, and extreme base of femur yellow; remain- 

 der of leg black. Middle and hind femora and tibiae infuscate yel- 

 low; narrow black above and below knee and at apex of tibiae; 



