4 University of Michigan 



All of the eight females have the dorsum of the mesothorax 

 brown, the mystax bright yellowish brown, and the legs and 

 antennae brown, but in two specimens the femora are partly 

 fuscus and in most cases the third antennal segment is dark- 

 ened somewhat apically. In all these females the wings are 

 dark fuscus and quite uniform through the series. The abdo- 

 men is extremely variable both in coloration and markings. 

 Two specimens have the light zones on segments two and 

 three ; two other specimens have these zones on segments two 

 and three and an additional zone on five ; one specimen has 

 only one zone, and that on segment three ; two specimens have 

 the abdomen black without zones, but with suggestions of 

 brown on segments two and three; and one specimen has no 

 light zones, but the abdomen is black and brown banded, with 

 most of the anterior part of each segment brown and the poS' 

 terior part black, although the last three segments are nearly 

 all brown. This last specimen I collected in Louisiana pairing 

 with a male which is black with the last four abdominal seg- 

 ments brown. In one female with three zones the abdomen 

 is entirely black otherwise, while in the light-zoned females 

 with more or less brown on the abdomen black is present in 

 variable combinations. 



A male specimen of Dizonias from Arizona, which I have 

 labelled D. Incasi Bellardi, differs from the males considered 

 above in the appearance of the hypopygium. The superior 

 appendages are longer and slenderer than in tristis and near 

 the middle of their length on the inner dorsal border each 

 bears a tuft of elongate, coarse, upright hairs which are bright 

 yellow in color, as is the tip of the abdomen beyond the apex 

 of the third segment. In tristis these appendages are short 

 and conical, with quite a different arrangement of white, 

 bristly hairs. It would seem, therefore, that the basis of sep- 



