92 PROC. ENT. SOC. WASH., VOL. 21, NO. 4, APR., 1919 



identical with Tyndaris which he places in the group with 

 toothed claws. In speaking of Chrysophana as having simple 

 claws, we cannot use it in the same sense as it is used in Polycesta, 

 so it is better to place it among those which have the claws 

 toothed. Since the name Tyndaris has been used for our North 

 American species, it is included in the above table for comparison. 



Paratyndaris, new genus. 



Form rather robust, cylindrical, narrower posteriorly. Head convex; 

 clypeus deeply triangularly emarginate at middle; antennal cavities very 

 small, situated in the lateral lobes of the clypeus near the eyes. Antennae 

 very slender and not reaching to the middle of the prothorax, serrate from the 

 sixth or seventh joint ; first two joints more robust than the following ; eleventh 

 joint ovate. Prothorax a little wider than long, convex, sides moderately 

 arcuate. Eyes large, elliptical. Scutellum small, slightly oblong. Elytra 

 gradually narrowed posteriorly, shorter than the abdomen; apices separately 

 rounded and quadridentate; lateral margins suddenly inflated towards the 

 humeral angles and covering the metasternal episterna. Prosternum with the 

 anterior margin only slightly concave. Last abdominal segment triangular, 

 longer than the elytra, terminating into a spine which is visible from above. 

 Tarsi shorter than tibiae; joints slender, first joint as long as the following 

 two joints united. Tarsal claws with an inconspicuous tooth near base. 



Genotype. -Tyndaris olneyae Skinner. 



This genus is erected for the North American species which 

 have been placed in the genus Tyndaris Thorns., but which are not 

 congeneric with the species of that genus from South America. 

 Besides the type, the following species are included: Tyndaris 

 cincta Horn, T. prosopis Skinner, T. chamaeleonis Skinner, T. 

 barberi Skinner, and Paratyndaris coursetiae Fisher. 



The genus is allied to Tyndaris Thorns., but differs from it by the 

 the following characters : Form more cylindrical, antennae more 

 slender and the joints serrate from the sixth or seventh joint, 

 while in Tyndaris they commence at the fifth joint. Prothorax 

 not twice as wide as long, tarsal joints not cordiform, and the 

 abdomen, which is longer than the elytra, terminating into a 

 spine and is visible from above. The species of Paratyndaris 

 are also more densely punctured and clothed with silvery pub- 

 escence. In general form Tyndaris resembles the genus Ac- 

 maeodera while Paratyndaris is more closely allied to Ptosima. 



In 1857 Thomson (Arch. Entom. I, p. 1(38) founded the genus 

 Tyndaris on Ptosima planata Cast, and Gory from Chile. Horn 

 (1885, Trans. Amer. Ent. Soc., XII, p. 147) described cincta, 

 the first North American species and placed it in this genus and 

 Skinner (190.3, Ent. News, XIV, pp. 2.30-239) described four 



