JAMES A. G. REHN AND MORGAN HEBARD 239 



The coloration of the species varies considerably in depth, 

 distinct recessive and intensive extremes being evident in the 

 series. The ovipositor varies somewhat in form, occasionally 

 having a regular, although gentle, decurvature, instead of a 

 slight bend, as in the allotype. 



A critical analysis of the paratypic series shows thei'e is much 

 variation in the spine formulae, a condensed summarj^ of the 

 extremes of which is as follows: 



Cephdlic feittorn Cephalic li.hiuc 



Ventro-cephalio Ventro-eaudal Dorso-caudal margin 



margin margin 3-6 (usually 4) 



4-8 (usually 6) 5-S (usually 8) 



Mill inn fonorn Mcdidn lihinc 



\'entro-cei)halic Ventro-eaudal Dorso-cephalic Dorso-caudal 



margin margin margin margin 



5-S (usually 7) 7-9 (usually 8) .3-.5 (usually 4) 4-7 (usually (i) 



Cduddl fciiiord 

 Ventro-external margin Venti-o-internal margin 



S-14 (usually 11) 7-12 (usually 9) 



The spines of the ventral margins of the cephalic and median 

 tibiae ai'e always six in number, except for an accidental mutila- 

 tion, and the dorso-cephalic margin of the cephalic til)iae is never 

 spined. 



At Marathon the species occurred in low acacia or cat's-claw. 

 and in a sweetflowered Inish growing with the acacia on the upper 

 slopes of the low hills to the east of the town. All the specimens 

 seen at this locality were taken. At Hackberry Creek a very few 

 were heard along a wash in heavy and high l>ushes, the specimen 

 taken having been secured, after dark, from a hackberry tree, and 

 at a height of fifteen feet from the ground. The specimen from 

 near Bone Spring was in a clump of mesquite on the edge of a 

 wash and was very wary and difficult to secure. A male was 

 heard, by Rehn and Hebard, at alwut twenty-five to thirty feet 

 from the ground in the top of a solitary willow tree in a wash, 

 at Neville Spring, Brewster County, Texas, elevation 3290 feet, 

 on Septeml)er 8, 1912. 



The note of this species is nuich like that of R. viduriac, but 

 is much sharper and louder, more like "kazit, kazit, kazit, kazit, 

 kazi't." 



TRANS. AM. ENT. SOC, XLVI. 



