106 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



to inner margin of orbits, their length not so distinctly reduced an- 

 teriorly as in previous species; ocellar bristles short, parallel; orbital 

 hairs numerous and short; pile on eyes barely distinguishable; arista 

 bare, swollen at base, entire length about H times that of anterior 

 width of frons; profile as in fig. 3. Mesonotum with two pairs of 

 dorso-centrals ; discal setulae very numerous, short, and irregular. 

 Abdomen ovate, apex and lateral margins with rather long hairs, 

 surface hairs short and not very numerous. Mid tibial bristles dis- 

 tinct. Wings as fig. 4. 



Length, 2.5-3 mm. 



Type-localily. — St. Joseph, Illinois, May 17, 1914, taken by the 

 writer and Mi'. C. A. Hart. Paratype, Algonquin, Illinois, May 17, 

 1894, W. A. Nason. 



The male agrees with the female except that it is more slender and 

 the wings are a trifle narrower. 



Food j^Zani.— Unknown. 



Paratype.— Cat. No. 19391, U.S.N.M. 



AGROMYZA VIRENS Loew. 



Female. — Differs from suhvirens only in the arrangement of the 

 orbital bristles, which is shown in fig. 5, and in having the frons dis- 

 tinctly buccate. 



Male. — Similar to female, but the pile is very conspicuous on a 

 small area on upper surface of eyes near to margin. Venation as 

 fig. 6. 



AGROMYZA GIBSONI, new species. 



Female. — Profile as fig. 7; frontal triangle rather broad, reaching 

 well beyond half way to lunule; anteriof pair of orbitals cruciate, 

 second pair incurved but inclining slightly backward, upper 2 pairs 

 very close together, the lower pair slightly incurved, the upper 

 slightly inclined outwardly ; orbital hairs numerous ; eyes without dis- 

 tinguishable pilosity. Mesonotum as in virens. Venation as fig. 8. 



Male. — Similar to female; hypopygium of normal size. 



Length 2 mm. 



Pupa.— Pale shining yellow. Segments, except the last 3 with 

 their anterior halves covered with closely placed microscopic setulae; 

 posterior spiracles short, disk-like, figs. 9 and 10. 



Length, 3 mm. 



Type-specimen. — Tempe, Arizona, reared from alfalfa, by E. H. 

 Gibson, for whom the species is named. Webster's number 12239. 



Type.—Q^t. No. 19392, U.N.S.M. 



I had difficulty in deciding whether this spech^s was distinct from 

 pJiaseoli Coquillett, described from specimens mining in stems of 

 French beans in Australia, but an examination of one of the para- 

 types forwarded from the United States National Museum proves 



