40 PROCEEDINGS OF THE NATIONAL M CSV I'M. VOL.XX. 



11. SINALOA, new genus. 

 (Geographical name.) 



Body shaped much as in Paraidemonct, male and female, briefly 

 pilose. Head a little prominent, the vertex well arched and the fas- 

 tigium rather rapidly descending, shallowly sulcate, the frontal costa 

 not very broad, about as broad as the interval between the eyes, sub- 

 equal, percurreut, sulcate; face but little retreating; eyes separated 

 by a tolerably narrow interval, narrower in male than female, rather 

 prominent in the male, considerably (female) or very much (male) longer 

 than the anterior infraocular portion of the geuae ; antennae moderately 

 stout, in the male much longer than the head and prouotum together. 

 Pronotum subequal in the male, but with slightly expanding front 

 margin and metazoua, distinctly enlarging posteriorly in the female, 

 both front and hind margin truncate, the latter feebly emarginate, with 

 slight percurreut median carina and no lateral carinae, the lateral lobes 

 vertical ; prozoua almost twice as long as, and less feebly punctate than, 

 the metazona, cut in the middle by a transverse sulcus, followed behind 

 by a sinuous or broadly W-shaped sulcus, both tolerably distinct. 

 Prosternal spine erect, conical, bluntly pointed; interval between meso- 

 sternal lobes feebly transverse in both sexes, the nietasternal lobes not 

 very close. Tegmiua brief, lobiform, lateral. Fore and middle femora 

 of male tumid; hind femora moderately long but stout, the spines of 

 the outer row of hind tibiae ten to eleven in number. Margin of 

 subgenital plate of male straight from the base, which is in no way 

 ampliate; cerci compressed laminate, subequal. slender; furcula con 

 sisting of a pair of parallel, attingent, slender, spine-like processes. 



The only species known is from Mexico. 



SINALOA BEHRENSII, new species. 

 (Plate III, fig. 7.) 



Body fusco- testaceous above, flavo-testaceous beneath, the two colors 

 separated on the sides by a broad blackish-fuscous band, extending 

 from behind the eyes across the lateral lobes of the pronotum, subequal 

 and well defined throughout but, at least in the female, slightly enlarged 

 and a little obsolescent on the metazona, continued, at least in the male, 

 on the sides of the base of the abdomen. Head flavo-testaceous, with a 

 mediodorsal, widening, blackish fuscous or dull fuscous stripe from the 

 base of the fastigium backward, sometimes broken ; face with extremely 

 feeble signs of delicate puncta, no more abundant on the frontal costa 

 than elsewhere; antennae flavo-testaceous, growing iufuscated apically. 

 Pronotum with the metazona transversely and snbrugosely punctate, 

 especially in the male and on the lateral lobes, simply punctate on the 

 disk in the female, transversely striate in the region of the lateral 

 carinae on the prozona, the median carina sometimes blackish fuscous 

 in continuation of the stripe on the head. Teginina fusco- testaceous, 

 somewhat darkest on anterior half, hardly so long as the prozona, 



