12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.73 



Thorax and abdomen shining black, the former thinly bluish grey dusted, 

 not vittate, scutellum not paler on margin than on disk; two strong, and 

 one very weak, pairs of dorsocentral bristles present behind suture ; wings 

 slightly and almost uniformly infuscated, the extreme bases of veins 

 yellowish infuscata, new species. 



16. Wings either largely infuscated or with well-defined dark markings in ad- 



dition to any that are present over the cross veins 17 



Wings hyaline, with at most clouds over the cross veins, and rarely with a 

 slight costal suffusion but no distinct markings ; arista plumose-- 20 



17. Yellow species, with clean-cut markings on the wings ; arista short haired_18 

 Dark brown species, with the wings intensely brown on costa and gradually 



becoming less dark posteriorly, but with no well-defined markings; arista 

 bare or pubescent 19 



18. Thoracic dorsum with two blackish vittae which extend to apex of scutellum, 



the pleura with two similar vittae, one on upper margin and the other on 

 upper margin of stern opleura ; wings marked vdth black as follows : A 

 costal streak from base extending to over second vein and running 

 obliquely across cross wing to hind margin in second posterior cell cover- 

 ing all of apex of wing, a cloud over inner cross vein, and another over 

 outer one, the latter extending to apex of fifth vein and back along that 

 vein almost to base of discal cell; in the large apical dark portion there 

 are three hyaline spots, one in submarginal cell and two in first posterior 



cell ; legs conspicuously marked with black geminata Fabricius. 



Thorax entirely yellow ; wings each with six large blackish spots, three along 

 costa, all of which extend more narrowly to third vein, the basal one in- 

 closing the inner cross vein, one at apex over tips of veins 3 and 4, some- 

 times divided into two, one over outer cross vein and one in fifth vein 

 just beyond middle of discal cell ; legs yellow, with extreme apices of hind 

 femora black quadrata, new species. 



19. Anterior one of the three pairs of postsutural dorsocentrals distinctly proxi- 



mid of middle of mesonotum, and distinctly closer to the suture than to 

 the posterior pair ; vertex not abnormally setulose. 



bfanneicosta, new species. 

 Anterior one of the three pairs of postsutural dorsocentrals distinctly behind 

 the middle of mesonotum, and about as close to posterior pair as to sutmre ; 

 vertex much more strongly and numerously setulose than usual. 



verticalis, new species. 



20. Cross veins of wings very faintly clouded ; species but slightly shining ; mid 



tibia with about seven short regular posterior setulae; hind femur with 

 at least one preapical anteroventral bristle. 



Beutominettia geniseta Malloch, 

 Cross veins of wings quite distinctly infuscated ; species distinctly shining__21 



21. Costa without any trace of a dark suffusion; mid tibia with about three 



rather long posterior bristles; hind femur with at least one evident pre- 

 apical anteroventral bristle Beutominettia assimilis Malloch. 



Costa v/ith a slight trace of a dark suffusion apically ; mid tibia with about 

 seven short regular posterior setulae; hind femur without an evident pre- 

 apical anteroventral bristle Deutominettia approzimata, new species. 



Note. — I have included in the above key the three species lacking the scutellar 

 setulae and without frontal black spots which I have now placed in DeutommeU 

 tia in this paper as there is some question as to whether they belong to the 

 latter or not. Only a thorough revision of the family by someone who has 

 access to a much larger amount of material than either Hendel or I have vdll 

 settle the matter of generic limits. 



