2 24 The Ohio Naturalist. [Vol. V, No. 2, 



fully considered heretofore in connection with species most like 

 it it is included. 



Chrysops lupus Whitney. Resembles proclivis, furcatus and 

 coloradensis. The frontal callosity, the facial callosities outside 

 of the sutures and a band on each cheek are black. Abdomen, 

 black, arranged almost as in proclivis except there is no small 

 black dot on either side of the second segment and the third and 

 fourth segments have the black more distinctly in the form of 

 spots necessitating more yellow and consequently making the 

 whole abdomen appear lighter in general coloration. The tvpe 

 was collected in Colorado and specimens are before me from 

 Laggan, Alberta, collected by Professor R. C. Osburn. 



Chrysops mitis Osten Sacken. Much like carbonarius. In 

 fact there is some doubt whether or not it should be considered 

 as distinct from that species. The absence of a hyaline spot at 

 the base of the fifth posterior cell and the somewhat larger size 

 separate mitis from its near relative. 



Chrysops nigripes Zetterstedt. Loew first reported this spe- 

 cies from Alaska and Coquillett recognized a specimen taken by 

 Kincaid of the Harriman expedition. This latter specimen is the 

 only one that I have seen, for it appears to be difficult to get even 

 European examples. The union of the apical spot and cross- 

 band seems to be the best means of separating it from noctifer 

 its nearest American relative. 



Chrysops noctifer Osten Sacken. I have seen the types of 

 both Osten Sacken and Williston and cannot see how it is possible 

 to recognize the two species noctifer and pertinax. The differ- 

 ence in the two descriptions is mainly found in the presence or 

 absence of reddish on the sides of the first two abdominal seg- 

 ments, and this appears to be too variable to be of specific value 

 I believe the two names are synon\-motis, and as noctifer is the 

 older, it must be retained for the species. The prevailing black 

 color of the whole body, and the apical spot separated from the 

 cross-band are characteristics. 



Chrysops pachycera Willison. Dr. Williston's types, a fine 

 series of specimens from Dr. F. H. Snow and collected by him 

 and his associates in Arizona and other specimens collected in 

 Lower California have given me the opportunity for studying this 

 species. 



The first antennal segment is swollen, the third segment is 

 much longer than the second, the facial and frontal callosities are 

 yellow. In both sexes the anal cell is hyaline at base and the 

 yellow on the sides of the first four abdominal segments is more 

 extended than in related species. 



Chrysops pikei Whitney. This recentl}' described species has 

 affinities with seqviax and univittatus. The first basal cell is 

 infuscated with the exception of a small elongate hyaline spot 



