MORGAN HEBARD 43 



Latiblattella lucifrons new species (Plate I, figures 18 to 23.) 



1907. BlutteUa dihitata Rehn, {not Blatta dilatata Saussure, 186S). Proc. Acad. Xat. 



Sci. Phila., 1907, p. 26. [c^, 9 , Palmerlee and Huachuca Mountains, Arizona.] 

 1910. Blattella dilatata Rehn, (not Blatta dilatata Saussure, 1868), Kansas Univ. 



Sci. Bull., x\', p. 300. [o\ 9 , Santa Rita Mountains, Arizona, 5000 to 8000 feet.] 



At the time the above determinations-^^ were made, Saussure's 

 dilatata was known only from the female type from Orizaba, Mexico, 

 with the description of which, females of the present species agreed 

 better than with those of any other known species. Though 

 we unfortunately have no topotypic material of that species, we 

 have a pair from San Jose del Cabo, Lower California, and a male 

 from Sierra El Tosti, Lower California, the latter taken in Octo- 

 ber, 1893. by Gustav Eisen. These specimens are apparently 

 typical of dilatata. When compared with the present species, the 

 males are found to be in general quite similar, but with very dis- 

 tinctive genital characters, of which one of the most striking is 

 the production of the latero-caudal angles of the sixth dorsal abdom- 

 inal segment and the decided constriction of the seventh and 

 eighth. The female is, in general, quite similar to that sex of the 

 present species, but has the tegmina and wings less reduced, ex- 

 tending, as in the type of dilatata, slightly beyond the apex of the 

 abdomen. 



The present species shows nearest relationship to L. rehiii, males 

 of this insect bear to males of that species a close resemblance; 

 they are separable by genital features, by the wilder interocular 

 space, strikingly paler vertex and normally decidedly heavier 

 ventro-lateral brown bands. ' In both sexes the head has the inter- 

 ocular-ocellar area more flattened, with eyes less decidedly pro- 

 jecting laterad, than in rehni. The females of the two species are 

 very different; in rchni this sex does not dift'er widely from the 

 male, while in the present species the sexes are very dissimilar, 

 the female having the pronotum much broader with caudal mar- 

 gin nearly straight, while the disk of the pronotum is much more 

 embrowned, as is the dorsum of the abdomen, which is but partly 

 concealed by the consideral)ly more abbrexiate tegmina and wings. 



^'^ All of the material upon which these were based is now before us and is listed 

 below. 



MEM. AM. EXT. SOC, 2. 



