308 GEO. H. HORN, M. D. 



This insect is so well known as not to require special comment. 

 The elytral sculpture is somewhat variable, the strise being quite 

 regular in some, although the greater number have the third and 

 sixth strise more or less confused. 



Widely distributed over the entire eastern United States and 

 Canada. A specimen in my cabinet from Nevada. 



This species is said to occur in Mexico by Mr. Jacoby, but from 

 the remarks it is probable that both this species and ovata are in- 

 cluded under the one name. At all events the figure rej)resents the 

 latter more nearly as far as the form and striaj are concerned. 



D. ovata Lee— Oval, moderately convex, piceous, with aeneous or cupreous 

 surface lustre. Autennfepale rufotestaceous. Head moderately punctate. Thorax 

 similar in form to borealis, equally densely punctate with intermixed punctures. 

 Elytra more oval than in borealis, the punctures of the striae finer, the intervals 

 flat, with numerous fine punctures. Body beneath and legs as in borealis. 

 Length .12 inch. ; 3 mm. 



This species is closely related to borealis, and was considered by 

 Crotch merely a variety, but the more oval form, the fine stride of 

 the punctures (which are sometimes obliterated posteriorly) and the 

 finely punctate intervals seem to make it a distinct species. 



Occurs in California and Nevada. 



D. libonoti u. sp.— Oval, slightly oblong, convex, piceous, head and thorax 

 blackish bronze, elytra blue green. Antennae piceous. Head sparsely, indis- 

 tinctly punctate. Thorax more than twice as wide at base as long, narrowed iu 

 front, sides feebly arcuate, disc convex, the punctuation indistinct, but inter- 

 mixed. Elytra not wider at base than the thorax and continuing the curve of 

 the sides, umbone small, disc convex, the striae composed of fine, not closely 

 placed punctures, the intervals flat, finely, but indistinctly punctulate. Body 

 beneath piceous. Abdomen sparsely punctate. Legs piceous, the posterior 

 femora slightly bluish. Length .10 inch. ; 2.5 mm. 



A smaller and less convex species than the other two and with 

 faintly punctured thorax, which is differently colored from the elytra. 

 The legs are entirely piceous. 



Occurs in Arizona (Morrison). 



Grovip XVII.— PSYLLIODES. 



Form oblong. Antennae 10-jointed, widely distant at base, in- 

 serted against the inner border of the eyes. Anterior coxal cavities 

 closed behind. Ventral segments free. Posterior tarsi inserted 

 above the end of the tibia and slightly to the outer side, the first 

 joint very long, the last slender, not inflated, the claws rather long, 

 slender and simple. 



