FLIES OF THE GENUS OGCODES — SCHLINGER 281 



New host records: (1) Tarentula kochi Koyserling, immature, 

 collected at Fish Canyon, San Gabriel Mts., Calif., by the author. 

 The parasite (9) emerged and became an adult in June 1942. (2) 

 Xysticus cunctator Thorcll, immature, collected at Davis, Yolo Co., 

 Calif., by the author. The parasite (9) emerged from the host May 9, 

 1949, pupated May 11, emerged as an adult May 16, and died May 

 23, 1949. 



Biology: Nothing has been recorded in the literature, and the 

 only known hosts are given above. 



Discussion: As mentioned above melampus is quite closely related 

 to eugonatus and may be only its melanic form. However, since 

 specimens of melampus are rare, occur in only a small part of the range 

 of eugonatus, and apparently are not limited simply by climatic 

 conditions, it does not appear possible at this time to establish the 

 fact that synonymy may be involved. Although the two species 

 appear to be sympatric, at least where melampus occurs, in no case 

 have the two species been taken together (that is, under identical 

 ecological conditions). In fact, melampus has only on few occasions 

 been taken in association with any other Ogcodes species and that 

 species, adaptatus, is a member of the distinctly different pallidipennis 

 group. 



At present melampus is differentiated from eugonatus only by its 

 darker coloration, and is apparently indistinguishable from the 

 northern European species, nigripes. For further notes see discussions 

 under eugonatus, nigripes, and zonatus. 



Ogcodes {Ogcodes) borealis Cole 



Plate figures 7, 56, 72, 85 



Ogcodes borealis Cole, Trans. Amer. Ent. Soc, vol. 45, p. 68, 1919; Psyche, vol. 30, 

 p. 48, 1923; Proc. Ent. Soc. Washington, vol. 26, p. 182, 1924.— Sabrosky, 

 Amer. Mid. Nat., vol. 31, p. 393, 1944; Amer. Mid. Nat., vol. 39, p. 413, 

 pi. 2, figs. 10, 13, 16, 1948. 



Western subspecies (?) of Ogcodes pallidipennis Loew, Sabrosky (in part only, 

 not figures), Amer. Mid. Nat., vol. 39, p. 418, 1948. 



Ogcodes colei Sabrosky (Grass Valley, Calif., specimen only, not figures), Amer. 

 Mid. Nat., vol. 39, p. 423, 1948. 



Diagnosis: Species of group iii with typical Ogcodes pattern (pi. 5, 

 fig. 29), but tergal posterior white fasciae are quite narrow; character- 

 ized by having vein Mi and cross veins r-m and m-cu distinctly 

 present (pi. 3, fig. 7), coxae black (males) or partially yellow (females), 

 otherwise legs yellow to browTiish yellow; mesonotum and scutellum 

 black, abdomen dark brown to black, the dark sternal fasciae broad 

 and of even width; antennal style with one to four small apical setae; 

 male genitalia with median plate of ejaculatory apodeme greatly 

 expanded basally, forming two distinct cells (pi. 11, fig. 72, and pi. 12, 



