83 



Chrysops iiavidus Wied. was the only one of its genus observed, 

 and owing to the lateness of the season only now and then a 

 specimen was seen. It is said to have been an abundant and 

 troublesome pest earlier. 



Tahanus atratus Fab. was occasionally seen. As in other locali- 

 ties, it is present through nearly the entire summer, but usually 

 not abunda? t enough to be considered a serious pest. Only a few 

 specimens were observed molesting horses and cattle. 



Tahanus lineola Fab. is a widely distributed species and every- 

 where is of especial economic importance. It was comimon at 

 Camcn^n, and is one of the three species referred to above as 

 heiug especially injurious. 



Tabanus costalis Wied., the common greenhead, was abundant 

 and appeared to be more persistent in its attacks than any of the 

 others. When sucking blood it is usually located on the under 

 parts or on the fore legs, where an animal has most difficulty in 

 reaching it, and once it alights it is pretty sure to satisfy its appe- 

 tite before leaving. 



Tabanus qiiiiujuejiiaculatus Wied. has not been reported from 

 the United States heretofore, but the commonest species observed 

 at Cameron agrees very closely with Wiedemann's description. 

 Besides, it is reported from Mexico by both Wiedemann and Bel- 

 lardi, so it would not be strange to find it in Louisiana. This 

 species appears much like costalis, but is larger, has two purple 

 bands on the eye instead of one, and the costal cell is hyaline. 

 It is also close to lineola in appearance, but the color of the vesti- 

 ture of the body is decidedly more yellowish, and the upper purple 

 band of the eye is noticeably narrower than in that species. 

 Besides, it averages larger than either costalis or lineola, but 

 undersized specimens are often met with. 



Since no systematic experiments were carried on at the Gulf 

 Biologic Station, what the writer has to say regarding remedies 

 may be considered as suggestions, derived partly from observa- 

 tions on the conditions existing in that section, and partly from 

 work and experience in Ohio. 



NATURAL ENEMIES. 



Xhe natural enemies of the Tabanidse is an interesting subject 

 for investigation at the Gulf Biologic Station. The writer is un- 

 der obligations to Messrs. Ashmead and Coquillett for the names 

 of most of the species mentioned below. 



Monedula Carolina Fab., a large and attractive species of the 

 familv Bembecidse, is common, and its habit of flying around horses 



