March, 1907.] AlDRICH : NORTH AMERICAN DiPTERA. 3 



before seen, the libraries of the California Academy of Science and of 

 the University of California being especially rich in entomological 

 literature. Unfortunately the former has now been entirely destroyed. 



The following additions are for the purpose of completing the 

 Catalogue up to January i, 1904, and not to bring it down to a later 

 date. 



Bigot's fragments in the Bulletin I have now straightened out, but 

 I doubt if their importance would justify the use of a page or two of 

 space to elucidate them. 



Most of the omissions are clerical mistakes, due to insufficient 

 checking up of my work ; only a few papers describing hew species 

 escaped me. As the Catalogue was prepared in odd moments, even- 

 ings, holiday vacations, Saturdays, etc., through a period of seven 

 years, I presume I need not apologize for my inability to avoid these 

 errors, although I keenly regret that they occur in the finished work. 



• ADDITIONAL GENERA AND SPECIES. 



CHIRONOMUS. 



halophilus Packard, Proc. Essex Inst., VI, 41 ; Report upon the Invert. Animals 

 of Vineyard Sound. — Mass. ; larvae in seawater ; adult not described. 



PLESIASTINA. 

 mexicana Giglio-Tos, Boll. R. Univ. Torino, VI, no. 84. [Ditomyia.) — Mex. 



MiK, Wien. Ent. Zeit., XIII, 26, gen. ref. 

 zonata Giglio-Tos, Boll. R. Univ. Torino, VI, no. 84. {Di/omyia.) — Mex. 



MiK, Wien. Ent. Zeit., XIII, 26, gen. ref. 



EUDICRANA (p. 140, before Sciophila). 

 I,OEW, Cent., IX, 23, 1869. 

 obumbrata Loew,.1oc. cit. — New York. 



SCIARA. 

 aequalis Williston, Trans. Ent. Soc. Lohd., 1896, 265, in table, no desc. — St. 



Vincent, W. I. 

 cingulata Rubsaamen, Berl. Ent. Zeitsch., XXXIX, 31, pi. I and III. — Ga. 

 picea Rubsaamen, Berl. Ent. Zeitsch., XXXIX, 32, pi. I and III. — Ga. 



ODONTONYX (p. 14S, before Rhynchosciara). 

 Rubsaamen, Berl. Ent. Zeitsch., XXXIX, 25, 1894. 

 helveolus Rubsaamen, loc. cit., 27, pi. II and III. — Porto Rico. 



RHYNCHOSCIARA (p. 1 48, before 6V^/ra). 

 Rubsaamen, Berl. Ent. Zeitsch., XXXIX, 29, 1894. 

 villosa Rubsaamen, loc. cit., 29, pi. I-III. — Oaxaca, Mex., and S. A. 



