170 PROCEEDINGS OF THE ACADEMY OF [April, 



Alcamenes cristatus Bnincr. 



1906. Alcamenes cristatus Bruner, Proc. U. S. Nat. Mus., XXX, p. 650. 

 [Sapucay, Paraguay.] 



2 c?, 5 9 . February and March, 1905. 



As suggested by Bruner {supra, pp. 650-651) the genus Alcamenes 

 is closely related to Prio?7oZop/?a, undoubtedly closer than it is to the 

 genus Tropinotus. 



TROPINOTUS Servillc. 

 1831 . Tropinotus Serville, Ann. Sci. Nat., XXII, p. 272. 

 Included Gryllus serratus Fabr., T. discoideus and ohsoleius Serville. 

 The first was removed to Prionolopha in 1873, the third to Colpolopha 

 the same year, and discoideus can be considered the type. 



Tropinotus discoideus Serville. 



1831. Tropinotus discoideus Ser\'ille, Ann. Sci. Nat., XXII, p. 273. 

 [Brazil.] 



11 d", 12 9 . February and March, 1905. 



This series contains a few specimens which have the lateral portions 

 of the disk of the pronotum, the dorsum of the head and the anal field 

 of the tegmina bright green. The maculations of the tegmina are 

 subject to a great amount of variation and in a few specimens are 

 almost absent, but in the great majority are distinct though faint. 



The presence or absence of the lateral apical spine on the caudal 

 tibiae appears to be of little or no value to separate genera in this 

 group, as it is not constantly present in the same species, and even 

 may be present on one limb and absent on the other of the same 

 individual. Representatives of this species present this latter condi- 

 tion. 



♦Tropinotus guarani n. sp. 



Types: c? and 9 ; Sapucay, Paraguay. February 25 (d^), March 

 9, 1905 ( 9 ). (William Foster.) [Hebard Collection.] 



Allied to T. regidaris Bruner, but differing in the hea\4er build, the 

 less evenly arched pronotal crest, the broader disk of the pronotum, 

 the slightly heavier limbs, shorter tegmina and the less regularly 

 maculate character of the same. 



Size medium; form robust; surface of body rugulose. Head with 

 the occiput distinctly inflated, a distinct median carina continuing 

 cephalad to the angle of the fastigium, this being accompanied by 

 lateral carinse lower and indefinite in character but constricted at the 

 highest point of the swell of the occiput, and connected with the 

 median carina by numerous low transverse ridges producing a scalari- 



