Vol. 89 , Nos. 5 & 6, May & June 1978 129 ANOTHER PREVIOUSLY UNDESCRIBED FEMALE OF A NEARCTIC SPECIES OF PARYDRA (DIPTERA: EPHYDRIDAE)' ^ Philip J. Clausen ABSTRACT; The female of Parydra (Chaetoapnaea) acuta Clausen is described, illustrated, and an allotype designated. Also, the description of the male is modified and changes in existing keys for both males and females are made. When the revision of the nearctic species of the tribe Parydrini (Clausen and Cook, 1971) was completed, four species of the genus Parydra were known solely from males. Later in Clausen (1977), this number was reduced to two species. Now, with the discoveries of the females of Parydra acuta, the females of only a single species remain to be described. Consequently, this paper should be considered as a supplement to Clausen and Cook (1971) and Clausen (1977). In my original description of the males of Parydra acuta, I have only recently discovered an error in the calculation of the ratios of the costal section of the wing. Also, Parydra acuta was described from just two male specimens, and I since have seen five more. Therefore, with the error and discovery of more males, I am herein modifying the description of the males, describing the females, and correcting the existing keys for both. Parydra (Chaetoapnaea) acuta Clausen EMagnosis: Costal section of wing from R\ to R2+3 1-3 to 1.7 times the distance from R2+3 to R4+5. Male with anterior ventral areas of tergites 3, 4 and 5 rounded or somewhat angled; gonites long, narrow and pointed, but not hooked at apex; aedeagus padually tapering to a pointed apex. Female abdomen with sternites 6 through 8 much wider than other sternites; sternites 6, 7 and 8 all subequal in length. Description: MALE. -As in Clausen and Cook, 1971, except wing with distance from h to Rj 0.48 to 0.58 mm; R2+3 to R4+5 0.51 to 0.61 mm; and costal section from Rl to R2+3 1-3 to 1.6 times distance from R2+3 to R4+5. FEMALE. -Total body length 2.38 to 2.72 mm; shining black with golden, coppery and greyish pruinosity. Head shining black with coppery pruinosity except where stated; Accepted for publication: February 27, 1978 Paper No. 10,217, Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul, Minnesota 55108. Department of Entomology, Fisheries, and Wildlife, University of Minnesota, St. Paul, Minnesota 55108 ENT. NEWS, 89, 5 & 6: 129-132, May & June 1978
BioStor
