14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



D. gracilipcs Loew. — Common; has been collected from June 19 

 to September 17; in copula August 6; comes to light. P. I. 



*Z>. intermedia Malloch. — Common; the known season extends 

 from June 11 to September 12 ; is attracted to light. P. I. 



*D. scutellata Malloch. — Common ; dates of collection range from 

 May 30 to August 29; obtained thus far only in Piedmont localities. 

 P. I. 



Genus CALIOPE Haliday. 



We have retained in this genus two species which appear to be 

 closely related to the genotype, but as the latter is not available to 

 us we can not say definitely whether they really belong to the genus 

 or not. The two species may be separated by means of the synopsis 

 below. 



KEY TO SPECIES. 



1. Intra-alar bristle present; sternopleurum with two bristles; species yellow, 



lutea (Coquillett). 



Intra-alar bristle absent ; sternopleurum with two bristles ; species largely 



black flaviceps Loew. 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



*C. -flaviceps Loew. — Rosslyn, Virginia, April 23, 1913, R. C. Shan- 

 non. 



Genus 3IINETTIA Robineau-Desvoidy. ,, 



KEY TO SPECIES. 



1. Knobs of halteres black ; prosternum bare ; thorax and abdomen black. 2 

 Knobs of halteres yellow ; prosternum u.sually with a few hairs 4 



2. All tarsi yellowish ; male hypopygial forceps slender, heavily chitinized and 



glossy on their apical halves; face with two small rounded humps near 



nouth margin longipennis Fallen.* 



Only mid and hind tarsi yellowish, the fore pair blackened ; hypopygial 

 forceps of male stout ; face without two small humps as above 3 



3. Thorax with four pairs of dorsocentral bristles; usually four series of 



setulae between the dorsocentrals ; male hypopygium as in figures 5, 6, 7. 



americana Malloch. 



Thorax with three pairs of dorsocentrals; six series of setulae between the 



dorsocentrals ; male hypopygium as in figure 8 obscura Loew. 



4. Thorax and scutellum black, densely pale gray pruinesceut, the margin of 



scutellum sooty black; abdomen yellowish testaceous; not annulated, fore 

 and mid femora and fore tibiae partly blackened male hypopygium as in 



figure 9 lupulina Fabricius. 



Thorax and scutellum not as above; if gray pruinescent the scutellum 

 has no sooty black margin 5 



* This species has been recorded from North America, but erroneously. The records 

 without doubt refer to one or other of the next two species in key. 



