CATALOGUE OF NORTH AMERICAN DIPTERA. 6/ 



Many new species, mostly described in a very brief and unsatisfactory 

 manner. 

 On Some Insects of Nova Scotia and Canada. Canadian Entomologist, iii.. 

 141; Oct., 1871. 

 A short list of Diptera occurring in Nova Scotia; no new species. 



In the appendix to " The Naturalist in Vancouver Island and British Colum- 

 bia," by J. K. Lord (London, 1866, 2 vols.). Walker described four new- 

 species of Diptera from those regions — Culex pinguis, Laphria columbica, 

 Cutercbra approximata and Eurygaster septcntrionalis. 



Note. — Walker's descriptions are notoriously bad. Osten Sacken, Cata- 

 logue, 1878, preface, p. xvi, has enlarged a little upon this subject. It was 

 the policy of Osten Sacken and Loew not to adopt Walker's names unless, 

 as is very rarely the case, the description contains some positive mark of 

 identification. In their view, it was preferable to describe as a new species 

 in doubtful cases. Some recent American workers have followed a differ- 

 ent principle, and recognized Walker's species on mere preponderance of 

 evidence ; this I take it is especially true of Mr. Coquillett. It is desirable 

 that each student of the order examine the descriptions for himself, and 

 form his own conclusions as to the recognizability of any particular one. 

 Furthermore, it is very desirable, in case that one of these specific names be 

 resurrected, that the species be redescribed at the same time; otherwise in 

 most cases other entomologists will be completely in the dark as to the 

 species referred to, and confusion will be increased. This pending a fuller 

 knowledge of the type, which must some time be arrived at. 



Walsh, Benjamin D. 



Insects Injurious to Vegetation in Illinois. Rock Island, 1861 (pamphlet). 

 Exorista (Senomctopia) militaris n. sp. (syn. of Winthcm'ia qiiadripiis- 

 tulata. 

 On certain Remarkable or Exceptional Larvje, etc. Boston Society of Nat. 

 Hist., IX, 286-308, 1864. 

 Mydas ftdvipes n. sp. 

 On the Insects, coleopterous, hymenopterous and dipterous. Inhabiting Galls 

 of certain Species of Willow. Proceedings of the Entomological Society 

 of Philadelphia, iii, 543-644 and vi, 223-288; 1864 and 1868. 

 Numerous species of Cecidomyidae and their galls, new. 

 First Annual Report on the Noxious Insects of the State of Illinois. Trans- 

 actions of the Illinois State Horticultural Society, appendix. Chicago, 

 1868. 



Trypcta pomoncUa n. sp., now referred to Rhagoletis. 

 Mr. Couper's Thorn-leaf Gall. Canadian Entomologist, i, 79, 1869. 



Cecidomyia crcetegi-bedeguar n. sp. 

 LarvjE in the Human Body. American Entomologist, 11, 137, 1870. 



" Contains description of three larvae of Homalomyia, designated as H. 

 zvihoni, leydii and pninivora. Perfect insect not described." O. S. 



"Washburn, F. L. 



Hessian Fly Reared in the Laboratory. Canadian Entomologist, xxxv, 316; 

 Nov., 1903. 



Existence of a second brood proved in Minnesota. 

 Gastrophilus epilepsalis. Canadian Entomologist, xxv, 320; Nov., 1903- 



A species identified as this affecting man as a subcutaneous parasite; 



