136 THE GYPSY MOTH APPENDIX. 



Prouotum with an irregular ivory-yellow callous on the dorsuni 

 anteriorly ; lateral margins with fine granular teeth. Humeral 

 angles very acute, terminating in slender spines which project an- 

 teriorly. A well-marked baud of dark-brown punctures extends 

 across the prouotum between the humeral angles, darkening to 

 black at the posterior margin. Post-humeral margins oblique and 

 curved. 



There is a large ivory-yellow bald spot in each basal angle of the 

 scutellum, flanked outwardly by a minute brown callous and in- 

 wardly by scattering brown punctures which extend in a band 

 across the scutellum. Behind these spots and separated from 

 them by a pale olive-yellow band is a well-defined dark-brown V- 

 shaped marking, posterior to which at the tip of the scutellum 

 there is an ivory-yellow crescent-shaped marking. 



Corium pale olive yellow, with a black dot outwardly nearly 

 opposite the apex of the V-shaped marking. Membrane glassy, 

 with a large dark-brown marking. Conuexivum olive yellow, 

 without dark markings. Uuder-surface without conspicuous mark- 

 ings, pale amber colored anteriorly, darkening to olive yellow 

 posteriorly. Ventral spine very long, reaching middle coxse. 

 Legs amber colored ; tarsi pale browu. 



Prof. Carl Baker of Auburn, Ala., has very kindly sent 

 me a specimen of P. acutissimus from Texas. This species 

 is the most conspicuously colored of any that I have ex- 

 amined, and may be recognized by the V-shaped marking 

 and bald spots on the scutellum, the transverse brown band 

 and sharp, curved spines of the pronotuui, the vitta of the 

 membrane and the long ventral spine. 



Distant has figured a specimen having a bald spot at the 

 middle of the base of the scutellum (Biol. Cent. Arner. 

 Rhync., pi. II., fig. 22). This specimen, which he states is 

 a typical one, is in the Stockholm Museum. The specimen 

 which I have examined lacks this marking, and it is presum- 

 ably a variable character. The rostrum is more slender than 

 that of any of our northern species, but is sufficiently stout 

 to indicate predatory habits on the part of the species. 



Distribution. Colorado, Texas, Mexico, Guatemala. 



