310 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



This subgenus apparently represents the most highly evolved form 

 of the subfamily Acrocerinae, and was evolved from species of the 

 colei group of the subgenus Ogcodes, appearing to be most closely 

 related to the uncommon vittisternum (see text fig. 2). 



The antennae of subgenus Neogcodes show a definite resemblance 

 to certain species of Pterodonlia Gray, but this similarity is no doubt 

 due to convergence rather than to any direct inherited development. 



Ogcodes {Neogcodes) albiventris (Johnson) 



Plate figures 17, 23, 30, 65, 92 



Oncodes albiventris Johnson, Psyche, vol. 11, p. 18, 1904. 



Ogcodes albiventris, Cole, Trans. Amer. Ent. Soc, vol. 45, p. 67, 1919; Psyche, 



vol. 30, p. 47, 1923.— Sabrosky, Amer. Mid. Nat., vol. 31, p. 390, 1944; 



Amer. Mid. Nat., vol. 39, p. 423, pi. 1, figs. 8-9, 1948. 



Diagnosis: Male: Antenna light brown, segment iii not much 

 longer than i and ii (pi. 5, fig. 23); head, thorax, coxae, trochanters, 

 basal one-third to one-fourth of femora, apex of last tarsal segment, 

 claws, halter knob and small spots on abdomen, black; abdomen white, 

 marked more or less as in plate 5, figure 30; dorsum covered with 

 long, dense, whitish yellow pile, about as long as hind metatai-sus; 

 wing venation weak, vein Mj, r-m and m-cu crossveins absent (pi. 4, 

 fig. 17); aedeagus as in plate 10, figure 65; ejaculatory apodeme as 

 in plate 12, figure 92. 



Female: Same as described for male except as follows: antennal 

 segment iii about one-thu-d shorter than in male; abdomen almost 

 entirely black, patterned about as in plate 5, figure 29, but white 

 fasciae extremely narrow, those on sternites slightly wider; abdominal 

 pile not quite as long as in male, and much less dense; cerci light 

 brown; legs mostly light brown, only coxae, trochanters and apices 

 of tarsi with some black, knees white. 



Holotype: 1 d", Toronto, Ontario, Canada, July 18, 1896 (MCZ). 



Distribution: Until the present, this species has been known 

 from only the holotype male from Canada and another male from 

 Livermore, Calif, (recorded by Cole, 1923, later studied by Sabrosky, 

 1948). The examination of five more specimens, including the 

 first female, has shown that albiventris ranges widely throughout 

 northern United States and southern Canada, yet individuals of the 

 species remain quite rare. 



New distribution records: (5 specimens.) 



British Columbia: 1 cf, Robson, Waldies Rd., June 29, 1947 (H. R. Foxlee, 

 CNM). 



California: 1 9 , Topaz Lake, Mono Co., June 26, 1957 (A. E. Pritchard, 

 CIS); 1 d", Palo Alto, July 22, 1892 (CM). 



Michigan: 2 cf, Muskegon, July 4, 1906 (C. A. HUl, CAS, EIS). 



