252 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



much advanced.) The top of the head is furnished with three slight 

 carinae. The lateral foveolfe are scarcely discernible as a group ot 

 punctations, but the tempora are plainly visible from above. The 

 frontal costa is prominent, not at all sulcate l)Lit plainly convex, broad, 

 with the sides sub-parallel. The face seen from the side is strongly 

 arcuate and moderately declivent. The antennae are sub-filiform, as 

 long as the head and pronotum. The pronotum has the disk slightly 

 elevated toward the median carina, which is very distinct and is cut 

 once plainly in front of the middle. The lateral carinas are distinct, 

 except between the first and third sulci where they are broken and 

 interru])ted. They are gently arcuate and convergent to the second 

 sulcus, beyond which they are slightly arcuate and strongly divergent. 

 The metazone is strongly angulate. The lateral lobes of the pronotum 

 are much higher than long, with the anterior and posterior margins 

 straight and very little inclined and the lower margin horizontal be- 

 hind, ascending before the middle. The mesosternal lobes are sepa- 

 rated by a space about as long as broad. The metasternal lobes are 

 nearly (female) or (|uite (male) contiguous behind and inclose two 

 deep pits. The tegmina and wings are very large. The former has 

 the discoidal area densely and irregularly reticulate. The posterior 

 femora are unusually heavy at the base, with the apical half slender. 

 The posterior tibi^ have the apical spurs on the inner side very large, 

 the anterior one being straight, twice as long as the one behind it and 

 scarcely shorter than the first tarsal joint. The valves of the ovipos- 

 itor are moderately exerted. The disk of the pronotum is velvety 

 black with a broad median longitudinal light stripe, and the tegmina 

 are distinctly maculate with large spots, as in Hippiscus. 



The genus is tropical American. It includes two species. The 

 type is Stenobothrus viatorius, Sauss. This species, with Scyliina pera- 

 graiis, Stal, from South America was made by Stal the type of the 

 genus Scyliina. But it is generically distinct from S. peragraiis, and 

 does not fall into Scyliina as it is given in his key. I have therefore 

 separated it. 



In part, Scyliina, Stal, 1873. Recen. Orth, I, 94. 



Key to Plectrophorus, n. gen. 



A.I Foveolas of the vertex semi-elliptical. Posterior femora orange, 

 with the apex blue i. — Viatorius, Sauss. 



A. 2 Foveolae of the vertex triangular. Posterior femora red, with the 

 apex blue 2. — Grcgarius, Sauss. 



