F. R. COLE 51 



Acrocera bakeri (PI. XII, fig. 34.) 



Acrocern bakeri Coquillett, Invertebrata Pacifica i, p. 23, (1904). Published 



by C. F. Baker. 



"Black, the four angles of the thorax, legs and halteres whitish, the protho- 

 racic spiracle and abdomen orange-yellow, the latter having the first segment, a 

 fascia on the second expanding on the sides and extending across the venter, a 

 small basal spot in the middle of dorsimo of the third and fourth segments, a 

 large spot on each side of the third segment extending across the venter, in the 

 middle of which it is greatly expanded, a small spot in basal angles of the fourth 

 segment and a pair of spots on the venter of this segment, black; tarsal claws 

 and last tarsal joint except the base, also black; wings hyaline, veins black, 

 calypteres wholly whitish hyaline. Length, 5 mm. A female specimen." 



Habitat. — Ormsby County, Nevada. Collected by C. F. 

 Baker. 



Tijpe.~^o. 6709, U. S. N. M. 



Acrocera bakeri var. arizonensis new variety (PI. IX, fig. 28.) 



Very near A . bakeri. Scutellum and the four comers of the thorax shining 

 black. Basal black triangular spot on second segment; another spot at base of 

 third segment and rounded spot at the base of the fourth. Abdomen orange- 

 yellow. Legs yellow, the coxae black. Venter yellow with black markings 

 under the genitalia. Wings gray hyaline with blackish veins, the venation as 

 in A . bakeri. 



Habitat. — One specimen, from Chiricahua Mountains, Ari- 

 zona, June 6. (H. G. Hubbard coll.) 



Acrocera fasciata (PL XI, fig. 33.) 



Acrocera fa sciat a Wiedemann, Auss. Zweif., ii, p. 16, (1830). 



"Head black. Corners of thorax and scutellum yellow. First black ab- 

 dominal band close to scutellum, goes clear across venter and unites on both 

 sides with the second. The third somewhat smaller with a widening on each 

 side. On either side of abdominal tip is a black spot. Costa of wing black; 

 squamae brownish. Legs pale yellow, last tarsal joint black. Length, I2- 

 lines. 



"Type. — Berlin Museum." 



This is probabl}' the best known American species and has been 

 bred from Lijcosa ocreata Hentz (L. stonei Montgomery) and 

 from Aviaurobius sylvestris at Waltham. A small male specimen 

 from Farmingham, Massachusetts, has the scutellum l)lack except 

 apex, and the wings are a clear, not a brownish hj^aline. The un- 

 interrupted bands on all of the segments readily distinguish the 

 species. A female measured five millimeters and had the scu- 

 tellum entirely yellow. Mr. C. W. Johnson in his paper on 



TRANS. AM. ENT. SOC, XLV. 



