OF WASHINGTON, VOLUME XIV, 1912. 123 



metopina, a new species described by himself as the type 

 some twenty-eight years before Brauer and Bergenstamm des- 

 ignated Degeeria arnica Meigen as the type of their genus 

 Admontia. Degeeria arnica Meigen, therefore, becomes 

 merely Hyperecteina arnica Meigen. Mr. Coquillett has 

 pointed out this fact in his paper, "The Type-species of the 

 North American Genera of Diptera." 



The representatives of the genus in America north of Mexico 

 may be separated as follows : 



1. The third abdominal segment in the female at most only nor- 



mally carinate on the venter 



The third abdominal segment in the female abnormally carinate 

 on the venter, the carina forming a wide lateral ridge and 

 thickly beset with short black spines; front in the male 

 two-thirds as wide as, in the female as wide as either eye; 

 bristly hairs on the sides of the face not arranged in a 

 single row; the third antennal joint in both sexes nearly 

 twice as long as the second; arista thickened on the basal 

 third, the penultimate joint broader than long; sides of 

 face each nearly one-half as wide as the median depression ; 

 cheeks one-fourth as broad as the eye-height; facial ridges 

 bristly on the lowest one-fourth to two-thirds; abdomen 

 gray pruinose on the basal margins of the last three seg- 

 ments; bearing both discal and marginal macrochaetae; 

 three sternopleural macrochaetse; the third vein bearing . 

 two or three bristles at its base. Length, 6 to 9 mm. 3 

 males and 5 females bred from Hylotoma hnmeralis Beauv. 

 Type 4061, U. S. Nat. Mus. (Can. Ent, Vol. xxx, p. 233.) 



hylotoma Coq. 



2. Third vein bristly less than one-half the distance from base to 



the small cross-vein 



Third vein bristly at least two-thirds the distance from base to 

 the small cross-vein; front in the female four-fifths as wide 

 as either eye; parafrontals and the parafacials grayish white 

 pollinose; sides of face each one-fifth as wide as the 

 median depression; frontal bristles descending to the lower 

 end of the eye; one bristle on the facial ridge above each 

 vibrissa; first two joints of antenna? and the palpi yellow; 

 arista thickened on the basal third; penultimate joint 

 as broad as long; thorax thinly dusted grayish-white polli- 

 nose; scutellum bearing three pairs of long marginal macro- 

 chaetse; three strenopleural macrochaeta?; middle tibiae 

 each bearing a single macrochaeta on the front side near 

 the middle. One female from San MateoCounty,California. 

 Type, 7671 U. S. National Museum. (Invertebrata 

 Pacifica, I, Feb. 10, 1904.) setigera Coq. 



