69 Journal New York Entomological Society. t"^'o'- xxvii. 



Soc. Nat. Hist., ii, p. 45, 1914, Mr. Van Duzee described Proarna 

 crepitans from California, which in 1915 he also removed to the genus 

 Cacama. So the genus up to the present has had five known species, 

 three from Mexico and two from the United States. 



In Cacama the tympanal coverings in the male entirely conceal 

 the orifices, which is also the case in the genus Tibicen, but the head 

 including the eyes is much narrower in Cacama, being little more 

 than two thirds the width of the mesonotum. The abdomen is broad 

 and much rounded behind ; in Tibicen it is more tapering. The api- 

 cal areas of the fore wings in Cacama are eight in number, the two 

 lowermost small and somewhat square in shape. In Tibicen the two 

 lowest apical areas are not as nearly of the same size, the seventh 

 being much smaller than the eighth. 



The type of the genus is Cacama maura (Distant), figured in Biol. 

 Centr.-Amer., and also in Genera Insectorum. Cacama longirostris 

 is also figured in Biol. Centr.-Amer. The remaining species, includ- 

 ing four new ones and a female from Yucatan, which has been iden- 

 tified as maura, are figured on the plates accompanying this article. 

 Owing to the lack of specimens available for its preparation the fol- 

 lowing table for the separation of species is not altogether complete. 



Genus Cacama. 



Rostrum not quite or barely reaching posterior coxae A. 



Rostrum reaching posterior coxae or beyond B. 



Rostrum reaching the first abdominal segment C. 



A black species. Basal cell of fore wings usually includes a darkened area 

 near front margin, translucent on hind margin ; anal membranes of both 

 pairs of wings grayish, sometimes slightly ochraceous with hind margins 

 gray. First and second transverse veins of fore wings hardly infuscated. 

 Black spot on dorsum of the pale colored eighth abdominal segment of 

 male quadrate. Abdomen above with first segment straw colored or prui- 

 nose ; beneath straw colored valvata (Uhler). 



Not as dark in color as the last. Basal cell of fore wings ochraceous, trans- 

 lucent in part ; anal membranes of both pairs of wings ochraceous. First 

 and second transverse veins of fore wings slightly infuscated. Eighth 

 abdominal segment of male almost entirely black, light colored each side 

 at base and near extremity. Abdomen orange colored beneath. Uncus 

 deeply notched at the extremity furcata new species. 



