1865.] 465 



distinguished by the broader vertex and the polished abdomen. The 

 two species are very closely allied, and I am still somewhat undecided 

 as to which is the true tarsata of Say, as his short description applies 

 to both species excepting the size, which alone has guided me in their 

 determination. 



3. Larrada montana, n. sp. 



Black; three basal segments of abdomen rufous: wings subhyaline; tarsi 

 brown. 



Female. — Black; head shining, the face silvery; mandibles and an- 

 tennae piceous-black. the latter subsericeous. Thorax closely and very 

 finely punctured; mesothorax and scutellum shining; pleura and rneta- 

 thorax opaque, with a more or less obvious cinereo-sericeous pile ; 

 tegulae brown. Wings sub- or fusco-hyaline ; nervures black. Legs 

 black, shining, slightlypruino.se; tarsi brown, paler at tips. Abdomen 

 shining, subsericeous ; the three basal segments rufo-ferruginous, the 

 rest black. Length 4J — 6 lines; expanse of wings 1\ — 9J lines. 



Six specimens. 



4. Larrada parvula, n. sp. 



Black; abdomen ferruginous, blackish at tip; tarsi brownish; wings sub- 

 hyaline. 



Male. — Black, opaque, clothed with a very fine, more or less dense, 

 silvery-cinereous pile, more brilliant on the face ; mandibles piceous ; 

 tegula? testaceous. Wings subhyaline, nervures fuscous. Legs piceous- 

 black, slightly pruiuose; tarsi brown, paler at tips. Abdomen shining, 

 ferruginous, sericeous, the three or four apical segments blackish or 

 dusky. Length 3 — 31 lines; expanse of wings 4J — 5 lines. 



Three specimens. Closely resembles the preceding species in color- 

 ation, and may possibly be the male of it; but the difference in size, I 

 should judge, is too great. 



$§. — Abdomen black, 

 o. Larrada iEthiops, n. sp. 



Deep black, shining ; wings fuscous, violaceous ; tips of tarsi brown. 



Female. — Entirely deep black, shining, very minutely punctured; 

 antennae subsericeous. Thorax : prothorax much depressed ; disk of 

 mesothorax with a broad, shallow longitudinal channel; metathorax 

 opaque, with a slight cinereous pile ; tegulae black. Wings fuscous, 

 deep violaceous, subhyaline at base. Legs black, shining; tips of tarsi 

 brown. Abdomen elongate, acuminate, entirely black, shining, and 

 when viewed sideways, with a beautiful, more or less distinct, silvery 

 reflection. Length 6 — 7 lines; expanse of wings 9 — 10 J lines. 



Two specimens. 



