12 



DIPTERA 



Asyndulum. Walker, List Dipt. Brit. Mus. Vol. i, j). 86 (1848) { fasciata) 

 Liponeura (in part). Loew, Stett. Ent. Zeit. Vol. 5, p. 118 (1844) {ciiierasieiis). 



Blepharocera (Macquart). Loew, Boll. Soc. Ent. Ital. Vol. i, p. 85 (1869); Loew, Schles. Zeitschr. 

 f. Ent. N. F. Vol. 6, p. 54, pi. i (1877); Osten-Sacken, Berl. Ent. Zeit. Vol. 40, p. 149 (i8g5) ; 

 Kellogg, Ent. News. V^ol. 10, pp. 3o5-3i8, f. 5 (igoo); Kertész, Cat. Dipt. \'ol. i. p. 282 (1902); 

 Kellogg, Proc. Calif. Acad. Sc. (3), Zool. Vol. 3, pp. 187-223, pi. 18-22 (revision of the genus) 

 (1903); .'\ldrich. Cat. N. Amer. Dipt. p. 171 (igoS) { fasciata). 



Characters. — Incomplete vein near the posterior margin of the wings; second longitudinal 

 vein simple without branches : no cross vein connecting veins tour and five. 



Biology. — Malesand females, and larvtu and puine known. Anatomy of larvae, pupas and imago 

 studied by Dewitz (Berl. Ent. Zeitschr. \'ol. 35, pp. 61-66. pi. 3-4, 1880), and Weirseijski (Krakow, 

 1881), for B. brevirostris Loew, and by Kellogg (Ent. News. \'ol. 10, pp. 3o5-3i8, f. 5, 1900; and Proc. 

 Calif. Acad. Sc., (3). Zool. Vol. 3, pp. 187-233, pi. iS-22, 1903) for B. teniiipes. Dewitz found larvae 

 and pupaî in the Ockerthal near Goslar (Harz Mts.) fastened to loose stones in the swift water, and 

 imagines flying about over the stream and often settling on projecting rocks. Rilev found (1881) larvae 

 and pupae oiB. tenuipes near W'atertown, New-York (LI. S. A.), and Constock has long known them at 

 Ithaca, New-York (U. S. A.) Kellogg has found the immature stages of 5. tenuipes at Ithaca and in the 

 Riviere des Chiens near Quebec, and of B. jordani in many streams near Stanford University, in the 

 Coast Range (60 miles away), while Grinnell has found them in a mountain stream near Pasadena in 

 Southern California. Kellogg records the immature stages of B. Osien-Sackeiii from several streams in 

 Northern, California. He noted j'oung larvae of B. tenuipes 2.5 mm. long in Coy Glen stream near 

 Ithaca, New-York on May 9; on May 14 the first pupae were noted; on May 20 the pupae outnumbered 

 the larvae, and on June i the'first flies issued, most of the pupae being transformed by June g. On June 

 27 man}- female flies were found feeding along another near-bv stream. Both of these streams were 

 careful!}- watched through the rest of the summer and all the autumn, but no other generation appeared. 

 Do the frail imagines live through the winter? The larvae of B. joidani Kell, have been found by Kellogg 

 in Los Gatos Creek near Stanford University, California, as earh* as Feb. 23 and as late as June i 

 (Stevens Creek, an adjoining stream), and at various times in the intervening three months. Pupae were 

 first found in these streams on April i and as late as June 4. 



The females of B. tenuipes catch small Chironomid mites on the wing, lacerate their bodies and 

 drink the bodv juices. The feeding of the males has not been observed. 



Geographical distribution of species. — Of the six species assigned to this genus three are 

 European and three North American. 



1. B. fasciata, W'estwood. Mag. Zool. (2), vol. 4, pi. g4 {Aesthcnia) (1842) (Europe). T3'pe species. — 



PI. I , Fig. 4; PI. 2, Fig. 25. 



limbipennis, Macquart, Ann. Soc. Eni. Fr. (21. vol. i, p. 63. pi. 3 (11S431. 



2. B. cinerascens, Loew, Stett. Ent. Zeit. Vol. 5, p. 118, pi. i, f. 6-10 {Liponeura) (1844) (Europe). 



fasciata, Schiner, Fauna Austr. Dipt. Vol. 2, p. 638 (excl. male) (1864) [BUpharicera). 

 Umbiiiervis, Macquart, .^nn. Soc. Ent. Fr. (2), Vol. 2 p. 69, pi. 3 (1844) {BUpharicera). 



3. 13. brevirostris, Loew, Schles. Zeitschr. f. Ent. N. F. Vol. 6, p. 67 {Liponeura) (1877) (Central Europe : 



Bohemia, Silesia). 



4. B. tenuipes. Walker, List Dipt. Brit. Mus. Vol. i, p. 86 {Asyndulum) (1848) (Northeastern United 



Statesand Eastern Canada). — PI. I, Fig. 7, 12. 



capitata, Loew, Berl. Ent. Zeitschr. Vol. 7, p. 298 (i863). 



5. B. jordani, Kellogg. Proc. Calif. .A.cad. Sc. (3), Zool. Vol. 3, p. 189, pi. 18, f. i, pi. ig, f. 3, pi. 20, 



fig. I and 2 (1903) (California). — PI. I, F ig. 8, 9. 



6. B. osten-sackeni, Kellogg, Proc. Calif. Acad. Sc. (3), Zool. Vol. 3, p. 191, pi. 18, f. 2, pi. 19, f. 2, 



pi. 20, f. 3 and 4 (igo3) (California). 



