ART. 11 SIPHOSTURMIA AND ALLIED GENERA EEINHARD O 



four specimens of haccharis, including both sexes, in my collection, 

 besides the type female and one additional specimen, also a female, 

 in the National Museum. 



M. pollinosus differs from H. 'bacchans^ the genotype, in having 

 the last three abdominal segments covered with dull thick brassy- 

 gray pollen, which on the intermediate segments extends nearly to 

 the hind border, leaving only a very narrow blackish margin behind ; 

 cheeks and face grayish-white pollinose; parafrontals only faintly 

 tinged with yellow. There appear to be no structural differences, 

 except the apical joint of the proboscis in male is noticeably longer 

 and the first abdominal segment has no median marginal bristles. 



Genus SIPHOSTURMIA Coquillett 



Siphosturmia Coquillett, Revis. Tachin., p. 83, 1897. 



Coquillett erected the genus Siphosturmia with Argi/rophylax 

 Tostrata Coquillett as the type and sole species. He did not give 

 any description of the generic characters other than stating that the 

 principal ones were mentioned in his accompanying analytical key. 



I have examined the type specimens now in the United States 

 National Museum and give a brief description of the genus as 

 follows : 



Generic characters (from the type species). — Proboscis very 

 slender, tapering apically, and distinctly exceeding the height of 

 head ; palpi present. Eyes bare. Front rather broad in both sexes ; 

 male without orbitals, female with two pairs; ocellars present, pro- 

 clinate ; the two uppermost frontal bristles reclinate, lower ones diver- 

 gent, extending to level of apex of second antennal joint. Antennae 

 inserted slightly above middle of eye, the second joint three-fourths 

 the length of third ; arista shorter than antennae, penultimate joint 

 more than twice as long as wide. Face flat and projecting below, 

 its lateral ridges also flattened and bearing only a few bristles above 

 vibrissae, which are distinctly above the lower margin of head; 

 parafacials bare. Oral cavity elongated by the head bulging behind 

 so that the proboscis may be completely folded within. 



Thoracic chaetotaxy : Humeral, 4; posthumeral, 3 (anterior one 

 small) ; presutural, 2; notopleural, 2; sternopleural, 2, 2; pteropleu- 

 ral, 1 (small); acrostichal, 3, 3; dorsocentral, 3, 4; intraalar, 3; 

 supraalar, 3; postalar, 2; scutellum with three lateral, one smaller 

 decussate apical, and one discal pair. Postscutellum well developed ; 

 no infrasquamal hairs present. 



Abdomen without discal bristles on intermediate segments; one 

 pair of median marginals on first and second segments; third with 

 a marginal row of about eight; fourth segment in female noticeably 

 deflexed, rather long and pointed, bearing numerous spiny bristles 



