76 THOS. L. CASEY. 



than the others, strongly carinated, last four joints compressed successively to a 

 greater degree. Joints of tarsi decreasing gradually in size. 



But one species has been discovered thus far in our territory. 



1. S. linearis Lee. — Color paler than that of the preceding species, body 

 less depressed, sub-cylindrical. Head sub-quadrate with a deeply excavated median 

 furrow extending from the front nearly to the posterior margin. Two small lat- 

 eral furrows originating at the front, extend back a short distance, diverging 

 slightly from the median line. Elytra deeply striate, with rows of very minute 

 punctures in addition. Prothorax punctured except on a narrow median line. 

 Head punctured and margined with an elevated border. Length fi.5 mm. 

 Texas. Plate IV. Fig. 11. 

 Quite rare in collections. 



PROSTOMIS Latr. 

 Jutrular pieces long and very acute, curving outward at their extremities. Men- 

 tum broadly emarginate in front. Ligula elongated and entire. Mandibles nearly 

 as long as the head, very broad and robust, denticulated internally. Antennae 

 about as long as the head and mandibles together; first joint large, second smaller, 

 sub-cylindrical; third elongated ; fourth to eighth globular; three last enlarged, 

 forming a loose club, which is herissate with long hairs. Eyes small, salient, 

 prothorax sub-quadrate, very lightly and sparsely punctured. Elytra narrowing 

 slightly posteriorly, striated with rows of foveate punctures, shining. First joint 

 of tarsi very small, next three almost equal in size ; fifth very long. 

 The only species known to us is the following : 



.1. P. americaiia Cr. — Light castaneous; body depressed, elongated, 

 broadest across the eyes. Elytra glabrous. Length 4.8 — 6.0 mm. 



Or., Nev., Cal. " Plate'lV. Fig. 12. 



Differs from the P]uropean nKutdthidaris in the following particulars : 



The mandibles are much longer, and the antennae are less robust than 

 in that species ; the color of our species is deeper, and the prothorax has 

 a well-marked median furrow which does not appear — from the single 

 specimen which I have had under examination — to be developed in the 

 first. But it is in the jugular ])ieces that the greatest difference exists, 

 those of our species being very long, slender, and attaining the tips of 

 the mandibles, while in the European species these plates do not approach 

 the tips within one-fourth of their length. 



However, with all these differences, which must be admitted to be of 

 minor value, I can only regard americana as a variety of m<mdihnlaris. 

 If the genus contained a large number of species, the above differences 

 might be regarded as specific, but in the present case there is but one 

 form known, and as the two races resemble each other so closely we are 

 warranted in assuming that these differences are only those due to local 

 influence. 



