136 bibioniDjE. 



c c c c. Thorax and abdomen of the male partly with black, partly 

 with pale hairs. Species 10. 

 a a a. Legs of the male black, of the female red. Species 11, 12. 



1. Marci, L.S.N, ii. 976. 38(1767); D. G. ; F. ; Gmel. ; Geoff.; 

 Schr. ; Panz. ; Meig. ; Mcq. ; Loevv ; Gim. ; Zett. — hrevicornis {mas), 

 L. ; F. ; Gmel. — -febrilis, Z. ; F. ; Schr. ; Gmel. Ater, nigro-pllosus ; 

 Mas, alls albis ad costam nigricantibus, stigmate nigricante, venis albis 

 apud costam nigris ; Foem. alls fuscis ad costam nigricantibus, venis 

 fuscis apud costam nigris. Long. 4-5 ; alar. 8-10 lin. 



Deep black, clothed with black hairs. Male. Wings white, blackish 

 along the costa ; stigma blackish ; veins toioards the casta black, the rest 

 white. Fern. JFings brown, blackish along the costa ; veins toioards the 

 costa and stigma black, the rest pale broton. 



Generally distributed. Its appearance is nearly contempora- 

 neous with St. Mark's day, whence its name. (E. S. I.) 



2. leucopterus, Meig. Kl. Zw. i. 110. 5 (1804); Hal.; Zett. 

 Ater, nigro-pilosus ; Mas, alis albis, venis albis apud costam nigris; Foem. 

 alls nigricantibus. Long. 3-4 ; alar. 6-8 Un. 



Black. Male. Body clothed with black hairs. Wings white ; veins 

 towards the costa and stigma black, the other veins white. Fern. TFiiigs 

 blackish, darker along the costa ; stigma and veins black. 



Not common. A vernal species. (E. I.) 



3. hortulanus, L. S. N. ii. 977. 46 (1767) ; Geoff. ; F. ; Gmel. ; 

 Eossi ; Schr. ; Latr. ; Meig. ; Mcq. ; Gim. ; Loew ; Zett. Niger, albido- 

 hirtus ; Mas, alis limpidis ad costam fuscis, venis albis apud costam nigro- 

 fuscis; Foem. thoracis dorso abdomineque I'nfo-luteis, alis cinereis ad costam 

 fuscis. Long. 3-4 ; alar. 6-8 lin. 



Black. Body clothed with tohitish hairs. Male. Wings limpid, brown 

 along the costa ; stigma and veins toioards the costa blackish-broicn ; the 

 other veins white. Fem. Thorax above and abdomen reddish-luteous. 

 Wings grey, brown along the costa ; veins towards the costa and stigma 

 blackish-brown; the other veins whitish. 



Not rare. A vernal species. (E. S. I.) 



4. venosus, Meig. Zw. i. 315. 10 (1818); Curt.! B. E. 138; 

 Mcq. ; Guer. ; Zett. — nervosa, Meig. Kl. Zw. Niger, albido-pilosus, alis 

 albido-hyalinis, stigmate minore nigro subovato, venis pallide fuscis basi 

 albis apud costam nigris. Long. 3^-4; alar. 7-8 lin. 



Black, clothed loith whitish hairs. Wings whitish-hyaline ; stigma 

 rather small, black, nearly oval ; veins towards the costa black ; the rest 

 pale brownish, white towards the base. 



Not common. A vernal species. (E.) 



5. Pomonse, F. Sp. Ins. ii. 410. 52 (1781); Gmel.; Herbst ; 

 Donov. ; Latr. ; Meig. ; Mc([. ; Gim. ; Loew ; Zett. Niger, nigro- 

 pilosus, alis limpidis, stigmate nigricante, venis albis ajjud costam nigris, 

 femoribus rufis. Long. 3|-4i ; alar. 7-9 lin. 



