Vol. XXV ] ENTOMOLOGICAL NEWS. 51 



the last femur has short or very short subequal numerous spines 

 or teeth, and no hair, sparse non-concealing hair, or long dense 

 hair. In the females the spines on the apical half or two-thirds 

 of the femur are longer and sparser than on the basal portion. 

 But hairiness in the male is not a characteristic of Arigom- 

 phus. In fact, it is not evident why Professor Needham in- 

 cluded spicatus in Arigoinphus; and in furcifer, which I agree 

 with him belongs in Arigomphns, the femur has very sparse 

 hair, and the term hairy could better be applied to viridifrons, 

 brevis and abbreviatus, for example. The position of the pos- 

 terior ham'ule of the male seems a valuable character, though 

 applicable only to the one sex. 



Not wishing at this time to discuss these subgroups of Gom- 

 phus, it is nevertheless necessary, in order to give some idea 

 of the relationships of the two new species described in this 

 paper, to point out some characters which they possess in com- 

 mon with others of the genus. Briefly some of these charac- 

 ters are as follows : Thorax green, varying in shade with age, 

 sex and species, and with distinct markings if present confined 

 to the region of the mid-dorsal carina and the humeral suture. 

 Face without dark markings. Legs robust, hind femora ex- 

 tending beyond the auricles ; in the male with short subequal 

 spines and more or less hair; in the female without hair, or 

 with very sparse hair, and with unequal spines, many of which 

 exceed the spines of the male and which are longest at about 

 two-thirds the length of the femur. Posterior hamule of male 

 directed posteriorly; posterior edge of seminal vesicle, seen in 

 profile, distinctly concave or excavated. Vulvar lamina one- 

 fourth to one-half length of segment 9, triangular, apex di- 

 vided for a short distance with the branches pressed together 

 or parallel. North America, east of the Rocky Mountains. 



The species may be grouped as follows : 



Legs dark, last femora black; furcifer, villosipes, cornutus, 

 lentulus, 1 australis. 1 



1 Australis and lentulus are known to me only from descriptions. 

 So far as I know, only the types are known, unless a male, referred by 

 Muttkowski to lentulus, should prove to be that species (New Records 



