244 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



Posterior tibiae without denticles at base of the external margin; male elytron 

 with two oblique veins; ovipositor rudimentary . . Anurogryllus Sau3sure 



4. Posterior tibiae serrulated before the spines .... Otlontogryllus Saussure 

 Posterior tibiae without denticles before the spines 5 



5. Both sexes completely apterous Cophogryllus Saussure 



Elytra perfectly developed, at least in the male sex 6 



6. Elytra of the male truncated at apex, without apical field; those of the female 



strongly reduced or absent 7 



Elytra of the male with more or less developed apical field; those of the female 

 never reduced to lateral lobes 8 



7. Body depressed, pubescent; frontal rostrum narrow . . . Gryl lodes Saussure 

 Body more convex, shining with a scarce pubescence; frontal rostrum wide. 



Gryllita Hebard 



8. Posterior metatarsi strongly enlarged, furrowed above, with serrulated ex- 



ternal margin; general shape short and stout; anterior tibiae with a large 



internal tympanum Hemigryllus Saussure 



Posterior metatarsi not at all enlarged, serrulated on both margins; anterior 

 tibiae with a large external tympanum; when the internal tympanum is 

 present, it is small, round 9 



9. Small species, with short elytra combined with very long wings (micropterous 



condition is present) ; facies of a Nemobius .... IVIiogryllus Saussure 

 Average size of the species larger; elj'tra and wings not so different in length. 



Achcta I,inn6 



10. Posterior tibiae armed with two apical spurs only on the internal face. 



Hygroneniobius Hebard 

 Posterior tibiae armed with three apical spurs either side 11 



11. Pronotum twice as wide as long Argizala Walker 



Pronotum about 1% times as wide as long. 



Pteronemobius Jacobson and Bianchi 



Genus Megalogryllus Chopard, 1929 

 Megalogryllus molinai Chopard 



Megalogryllus molinai Chopard, Rev. Chilena Hist. Nat., vol. 33, p. 523, fig. 2, 

 1929. 



Specimens examined: Bolivia: Blanca Flor, Julj^-Aiigust 1921 

 (Icf, 299), Januar^^ 1922 {2 6'&, 19), Mann. PERtJ: Pucallpa, Jan. 

 11, 1948 (Icf, 299), Schunke. 



Remarks: This species was previous!}" known from Brazil and 

 British Guiana. 



Genus Anurogryllus Saussure, 1877 



Anurogryllus muticus (De Geer) 



Gryllus muticus De Geer, M^moires pour servir h I'histoire des iusectes, vol. 3, p. 

 520, pi. 43, fig. 2, 1773. 



Specimens examined: Bolivia: Caiiamina, July 1921 {!&), 

 Mann; Espia (l&), Mann; Iv6n (19), Mann; Rosario, Oct. 28- 

 Nov. 9, 1921 (19), Mann; RuiTenabaque, October 1921 (19), Mann. 

 PERtJ: Chanchamayo, June 3, 1948 (1 cT), May 6, 1948 (19), Schunke; 

 La Merced, Jan. 31, 1949 (Icf), Schunke; Pucallpa, Mar. 2, 1948 



