NORTH AMKRICAN COLEOPTERA. 133 



SYIVETA Esch. 



In my essay on this genus (Trans. Am. Ent. Soc. xix, p. 3) an 

 error has occurred owing to the improper recognition of the actual 

 type of simplex in the LeConte cabinet. 



The species cited above as simplex shoukl be called hamata, from 

 the structure of the male hind tibi?e. 



S. simplex Lee. — Entire body yellowish testaceous, sometimes with the 

 head and thorax slightly brown. Head coarsely punctate. Thoiax strongly 

 angulate at the sides not denticulate, coarsely punctate. Elytra with confused 

 coarse punctuation without serial arrangement and without trace of costfe. 



Male. — Last ventral segment deeply sinuate each side, the middle projecting 

 as a rounded lobe; hind tibise gradually broader to apex as in albida, and with 

 terminal spur. 



Female. — Last ventral with a semicircular pubescent couciivity at apex ; hind 

 tibife less thickened than in the male and with a spur. 



In this species the antennae are formed as in albida, that is the 

 joints 8-11 are shorter than the joints 4-7. It may be separated 

 from albida by the more strongly angulate thorax, the entire absence 

 of costse and the confused punctuation. 



The type specimen came from Steilacoom, in Oregon ; others have 

 been given me by Mr. E. A. Schwarz from Astoria and Tenino. To 

 him I am indebted for having my attention called to the mistake 

 above mentioned. 



OOMORPHUS Curtis. 



O. floridaiiiis u. sp. — Oval, convex, piceous black, shining, recalling Or- 

 philus in form. Head very finely alutaceous, indistinctly sparsely punctate, a 

 short linear frontal impression. Thorax more than twice as wide as long, the 

 sides nearly straight and rapidly divergent from apex to base, disc convex, 

 sparsely indistinctly punctate. Elytra with rows of moderately coarse punc- 

 tures not closely placed, the intervals with a single series of irregularly placed, 

 smaller punctures. Body beneath piceous black, abdomen finely transversely 

 alutaceous. Length nearly .10 inch. ; 2.5 mm. 



No sexual peculiarities have been observed. 



The genus Oomorphus is one of those genera which have been 

 assigned various relationships by those who have studied them. For 

 an interesting recital of those of Oomorphus the student may con- 

 sult the " Genera" x, p. 219. 



At present the position usually accej^ted is in relationship with 

 Lamprosoraa. The Lamprosomini form a tribe of the Cyclique 

 division of the Chrysomelidie, taking position between the Crypto- 

 cephalini and Eumolpini. From all the other tribes of Cy cliques 

 the Lamprosomini are distinguished by the pi-esence of grooves at 



TfiANS. AM. ENT. SOC. XX. JUNE, 1893. 



