NO. 2293. PARASITIC CHALCIDOID FLIES— TIMBERLAKE. 157 



7. HOMALOTYLUS SCYMNI (Shlir.er). 



Eutclus ? scymnae Shimer, Trans. Amer. Entom. Soc, vol. 2, Nov., 1869, p. 385. 

 This species remains unknown to the writer. The description 

 suggests alhitarsus Gahan, but there seems to be enough difference to 

 avoid s3-nonymizing the latter species at least for the present. Ash- 

 mead, however, synonymized the species with terminalis (Say), on 

 apparently insufficient evidence. Doctor Shimer reared his speci- 

 men from the larva of a Scymnus species feeding on Caermes pinicor- 

 ticis (Fitch), probably at Mount Carroll, lUinois. 



VICINUS GROUP. 



KEY TO THE SPECIES OF THE VICINUS GROUP. 



1. Head longer than wide, oval in outline 2 



Head seen from in front hardly longer than wide, or nearly circular in outline; 



head and scutellum orange rufous, the mesoscutum greenish black, legs dark, 

 blackish brown, the hind tarsi and three middle joints of middle tarsi white. 



8. quaylci, new species, 



2. Head and body not entirely black , 3 



Head and body black with green and bluish luster, legs black, the hind tarsi, and 



the three middle joints of the middle tarsi white, antennae black, the club and 

 more or less of the preceding joint white 9. africanus, new species. 



3. Head and scutellum cadmium yellow, the mesoscutum and abdomen greenish 



black; front legs and middle tibiae pale brown, the middle femora, middle and 

 hind tarsi whitish, the hind femora and tibiae blackish, antennae black, the 

 club and last three or four funicle joints yellowish white.. 10. oculatus (Girault). 

 General color more or less dark castaneous, the mesoscutum blackish with a greenish 

 luster, the scutellum opaque black; legs castaneous with front and middle 

 coxae, base of front and middle femora, and the hind legs blackish, middle tibial 

 spur yellowish white, the three middle joints of middle tarsi and the hind tarsi 

 except apical joint white, the lower margin of hind femora distally pale yellow- 

 ish; antennae black or blackish, the club white 11. vicinus Silvestri. 



8. HOMALOTYLUS QUAYLEI, new species. 



Plate 39, fig. 9. 



Female. — Head in frontal view very nearly circular in outline, 

 being a trifle longer than wide; the dorsal orbits of eyes strongly 

 converging posteriorly so that the width of tlie vertex at the posterior 

 ocelU is less than half that of the face at the lower corners of eyes; 

 ocelli placed in a strongly acute-angled triangle, the posterior pair 

 about one-third nearer tlie occipital margin than to the median 

 ocellus ; eyes slightly longer than in H. Jlaminius, and the head in 

 side view somewhat thicker, being thickest below the middle instead 

 of at the middle; face slightly protuberant between the bases of the 

 antennae (the latter broken off in the unique type). Mandibles 

 with moderately long teeth, the middle one slightly longer than the 

 ventral and less acute, the inner or dorsal tooth shortest, distmctly 

 not forming a subtruncate edge with the middle tooth, as the emar- 



