Occasional Papers of the Museum of Zoology 5 



almost entirely black above, seventh black. Ovipositor black, 

 rather slender and about equal in length to abdominal seg- 

 ments five, six and seven combined. 



Type Specimen : ]\Iale from Phantom Lake, Fort Davis 

 Quadrangle, Davis Mountains, Texas; F. M. Gaige, collector; 

 Musevmi of Zoology, University of Michigan. Several other 

 specimens of both sexes from the same locality are in the col- 

 lection. A male from Costula, Texas, collected by the late F. 

 C. Pratt and belonging to U. S. National Aluseum is referable 

 to this species. 



Remarks: Specimens of Erax easily become discolored and 

 greasy, and are therefore sometimes hard to place with descrip- 

 tions, especially when these are based on color. The color of 

 this species is taken from good specimens, which appear some- 

 what diiterent from others that are discolored, but there will 

 be no trouble in locating the male of Bra.v arniatus by the 

 peculiar structure of the hind tibia. There are three species 

 of Erax known from North America with modified hind 

 tibiae ; in Bra.v tagax and Brax sagar the modifications are at 

 the distal thirds of their respective hind tibiae, while in Brax 

 arniatus the modification is of different appearance and near 

 the middle. This character is not present in any case in any 

 of the females of the various species. 



Brax interruptus Macquart. — Numerous specimens of this 

 very common southern species are included in the collection. 

 The male has the hypopygium, from side view, plainly divided 

 at the apex by a deep incision, furnishing a definite character 

 for identification. 



Mallophora fautrix Osten Sacken. — I\Iore than a dozen 

 specimens of both sexes. The species is quite bee-like in 

 appearance on account of its furry body. I have taken this 



