NO. 2293. PARASITIC CHALCIDOID FLIES— TIMBERLAKE. 171 



Labial palpi with thi-ee joints; the maxillary with four joints, the 

 two basal ones subequal, the apical one about twice as long, the 

 third a little shorter than the apical. Thorax, legs, and abdomen 

 practically as in Homalotylus , the ovipositor not protruded. Wings 

 differing in having the stigmal and postmarginal veins meetmg in 

 a much less acute angle, the postmarginal only about one-half as 

 long as the stigmal, which is noticeably shorter than in Homalotylus; 

 the basal and subapical areas of paler-colored cilia present, the 

 integumentary fuscous spot beneath the stigmal vein reaching but 

 little more than halfway across the disk of the wing. 



Male. — Similar throughout to the female. 



Anisotylus presents a combination of the characters of Homaloty- 

 lus Mayi- and Isodromus Howard. In the shape of the head it is 

 like the latter; in the structure of the thorax and abdomen it is not 

 unlike Homalotylus, and in the venation of the wings it is inter- 

 mediate between the two. The bidentate mandibles, in which it 

 differs from either, by no means indicate relationship with the 

 Ectromatini, as the genus is immistakably closely allied to Homaloty- 

 lus. TLe sculpture and pubescence in character and arrangement 

 are of the same type as in Homalotylus. The species so far as known 

 are parasitic in the larvae of Scym/nus and Hyperaspis. 



Type of genus. — Homalotylus similis Ashmead. 



KEY TO THE SPECIES AND SUBSPECIES OF ANISOTYLUS. 



i. Distal half of flagellum yellomsh white 3 



Fiagellum entirely black or dark brown. 



ivlesoscutum metallic greenish black 2 



Mesosciitum and abdomen metallic purplish black; the fronto vertex and 

 scutellum Sanford's brown; rest of head and iinderparts of thorax brownish 

 yellow 1. similis (Ashmead) 



2. Frontovertex, axillae, and scutellum zinc orange; the rest of head and underparts 



of thorax brownish yellow; the abdomen bronzy black above, the venter more 



or less yellowish 2. similis texanus, new subspecies. 



Frontovertex ochraceous orange; the rest of head and underparts of thorax a little 

 paler yellow; the abdomen and the entire notum of thorax, except rarely the 

 scutellum, greenish black 3. similis utahensis, new subspecies. 



3. Head, underparts of thorax, venter, and legs except hind tibiae yellow, the notum 



of thorax and dorsum of abdomen greenish black. . 4. pallentipes, new species . 



1. ANISOTYLUS SIMILIS (Ashmead). 



Homalotylus similis Ashmead, Trans. Amer. Entom. See, vol. 14, Nov., 1887, 

 p. 190. 



Feimde. — Head slightly longer than wide, the frontovertex about 

 twice as long as the width at the ocelli, the latter in an acute-angled 

 triangle, with the space between the posterior pair about equal to 

 three-fourths of the space between either and the anterior ocellus. 

 Scape increasing slightly in. width from the base toward the apex, 

 being somewhat expanded along the inner ventral margin; pedicel 



