AET. 7 AMERICAN MUSCOID FLIES 11!^ VTEN'N'A MUSEUM — ^ALDRICH 7 



84. BHINOMACQUARTIA CHAETOPHORA Braaer and Bergenstamm 



Bhinomacquartia chaetophora Beatjee and Bergenstamm, Denk. Wien. 

 Akad. Wiss., vol. 58, 1891, pp. 373, 380, 404 ; vol. 60, 1893, p. 134. 



One female, the type, collected by Natterer at Ypanema, Brazil, 

 and so labeled in abbreviated form. The species is so remarkable 

 that it can not be placed in very close association with any known 

 to me. Brauer and Bergenstamm in 1891 placed it first in Group 

 Pseudodexiidae. Within this group however they have several sub- 

 divisions to which they give the family ending, and they recognize 

 Ehinomacquartiidae for this sole species on page 380; but on page 

 404 they have " subgroup Bhinomacquartia " consisting of this genus 

 with a few others doubtfully added. In 1893, they divide " Sectio 

 Pseudodexiidae " into 17 subsections one of which is Rhinomacquar- 

 tia, containing only this single genus and species. As their " Group 

 Pseudodexiidae " is very heterogeneous, they in effect indicate no 

 close relatives of the present genus. They were puzzled as to the 

 sex of the specimen; the somewhat distorted apex of the abdomen 

 did not seem to show male characters, but the front had no orbitals, 

 so they put it down as a male with an interrogation. I relaxed the 

 specimen and examined the abdominal structure and find it a female. 



The hypopleural bristles and postscutellum are well developed 

 (I examined the latter while the specimen was relaxed). The arista 

 is plumose above, below and in several other planes; it is hardly 

 longer than the third antennal joint, and curved downward. The eyes 

 are densely hairy. The head is flat behind and elongated forward, 

 the length at antenna and epistoma are the same ; this makes the para- 

 facial unusually wide; it is nearly covered with uniform fine hair 

 gradually becoming longer below. The front is quite prominent, 

 broad, apparently without orbitals ; ocellars broken off, outer vertical 

 hairlike; the frontals very small above, the row ending at antennal 

 insertion. On one side there is a scar on the parafrontal a little in 

 advance of the anterior ocellus while on the opposite side the cor- 

 responding scar is considerably farther forward. Whether these 

 represent a pair of reclinate verticals or a pair of orbitals I can 

 not tell. Epistoma strongly thrust forward between the vibrissae, 

 the face concave in profile, ridges bare. Proboscis short, fleshy, palpi 

 normal. Third antennal joint with parallel sides, rather elongate, 

 more than twice the second ; basal joints of arista small. Micrometer 

 measurements of the head are as follows : width, 55 units ; length at 

 antennae, 38, at epistoma the same; height, 48 (eye, 33, cheek, 15) ; 

 vertex, 16 (or 0.29 of head width). 



Thoracic chaetotaxy: acrostichal 3 anterior, posterior doubtful; 

 dorsocentral, 3, 4 (the second posterior small and irregularly placed) ; 

 humeral, 4; posthumeral, 2 (the hind one small); presutural, 1; 

 notopleural, 2; supraalar, 3; intraalar, 2; postalar, 2; sternopleural, 



