Feb., 1901] Hine— A New Gomphus. 61 



the ninth abdominal segment, gradually narrowed, apical third 

 ■divided and the two parts divaricate. 



Described from fourteen males and a female taken at Loudon- 

 ville, Ohio, June 14, 1900; and a male and female taken at Ohio Pile, 

 Pa. — the latter two specimeus by E. B. Williamson. 



The species averages larger than either brevis or abbreviatus and 

 may be separated from the former readily by its green face, by the 

 striking differences in the vulvar lamina and by the hamules and 

 male appendages. In brevis the tooth on the appendage is nearer the 

 end and the space from it to appex is noticeably curved while in 

 viridifrons this space is practically straight. 



It has more points in common with abbreviatus^ but in that 

 species the vulvar scale is short and triangular, the hamules are 

 smaller and shorter, and the tooth on the superior appendage of the 

 male is much farther from the apex. 



Through the kindness of Dr. Calvert and Mr. Williamson I have 

 at my disposal, specimens from which many of the accompanying 

 drawings were made. In viridifrons, brevis and abbreviatus I have 

 made drawings from different specimens of the same species to show 

 slight variations. 



This is Gomphus sp. Williamson, Dragonflies of Indiana, 294. 



A COMPARATIVE STUDY OF GOMPHUS FURCIFER 

 AND VILL0SIPE8. 



James S. Hine. 



It seems that nearly every author who has considered these two 

 species has compared them. Considering general appearances they 

 are much alike but can be separated easily by several details and as 

 I have good material of both sexes of the two species before me, I 

 thought it might be of consequence to consider in a comparative way 

 some of their characteristics. 



The occiput in both sexes of villosipes bears a prominent tooth at 

 the middle of its upper edge. This tooth varies some in different 

 specimens, it ends above in a single point or it may be widened and 

 end above in three or more points. In furcifer there is no tooth on 

 the occiput in either sex. 



The vulvar scales are very different, in villosipes the part may be 

 said to be triangular with the free sides curved and the apical part 

 divided for about half the length of the scale, ^n furcifer its basal 

 part is similar but the ai^ical part is produced, giving quite a 

 different form. In the former species the scale is about one-third as 

 long as the ninth segment, while in the latter it is about three- 

 eighths as long as that segment. 



