1904.] NATURAL SCIENCES OF PHILADELPHIA. 535 



Genus SINALOA Scudder. 

 1S97. Sinaloa Scudder, Proc. U. S. Nat. Mus., XX, p. 40. 

 Type. — S. hehrensii Scudder. 



Sinaloa brevispinis n. sp. 



Types: d and ? ; Victoria, Tamaulipas, Mexico. January 14 or 15, 

 1903. (S. N. Rhoads.) Acad. Nat. Sci. Phila. 



Allied to ,S. hehrensii from Sinaloa. but differing in the shorter but 

 distinctly spiniform furcula, the subtruncate tips of the tegmina, and 

 in the different coloration. 



d^ .—Size rather small. Head with the occiput flattened ; interspace 

 between the eyes but little more than half the width of the frontal costa ; 

 fastigium strongly declivent, rather shallowly excavated; frontal costa 

 subequal, except above where it is slightly narrowed, moderately sul- 

 cate at and below the ocellus; eye ovate, moderately prominent. 

 Pronotum strongly rugoso-punctate, with the median carina present 

 as a rather coarse ridge, subobsolete between the sulci, the traces of 

 the lateral carina of the faintest character; transverse sulci distinct; 

 prozona almost twice as long as the metazona ; anterior margin arcuate, 

 posterior margin with a broad shallow median emargination; lateral 

 lobes slightly longer than high, the posterior and inferior margins 

 sinuous. Prosternal spine erect, retrorse, rather blunt; interspace be- 

 tween the mesosternal lobes longitudinal, almost twice as long as wide ; 

 metasternal lobes subattingent. Tegmina reaching to the apex of the 

 metanotum elongate-ovoid, apex rotundato-truncate, longitudinal 

 veins distinct. Abdomen faintly carinate above, the apex somewhat 

 upturned; furcula spiniform, compressed, attingent, as long as the 

 last dorsal segment; supraanal plate semi-ovate, apex obtuse-angu- 

 late, median ridge dividing centrally and sending forward two parallel 

 branches, lateral sections of the plate rather deeply excavated ; cerci 

 simple, about two and a half times as long as the basal width, moder- 

 ately tapering, the apical fourth with a slight emargination of the 

 posterior margin ; subgenital plate moderately produced, the apex mod- 

 erately acute but not elevated. Anterior and median limbs with the 

 femora considerably inflated; posterior femora robust, genicular 

 region rather large ; tibia with nine spines on the external margin. 



9 .—Size medium. Head with the interspace between the eyes but 

 little narrower than the frontal costa; frontal costa evenly but dis- 

 tinctly constricted inferiorly as well as above the ocellus ; eye elongate- 

 subovate, distinctly longer than the infraocular portion of the gense; 

 antenna slightly shorter than the head and pronotum, blunt. Pro- 



