634 



FAMILY XXVI. XITIDULIDJE. 



ginate and a small additional segment visible. Five are known 

 from the eastern United States, all of which may occur in Indiana, 

 though but three have as yet been taken. 



KEY TO THE SPECIES OF COLASTUS. 



(7. Hind angles of thorax distinct. 

 6. Scntellum smooth at tip. 

 c. Form broadly oval. 

 d. Thorax with an oblique pit or fovea in each hind angle. 



1217. MORIO. 



dd. Thorax without fovea; elytra each with four reddish spots. 



MACULATES. 



vc. Form oblong, much depressed : elytra dull yellow, the sides and 

 apex narrowly piceous. 121S. semitectus. 



bh. Scntellum densely punctured; color uniformly piceous. uxicolok. 

 aa. Hind angles of thorax obtuse, rounded; form oblong-oval, depressed. 



1219. TRUNCATES. 



1217 (3685). Colastus moeeo Eriehs.. Germ. Zeitschr.. IV. 1843, 242. 

 Broadly oval, depressed. Piceous black, shining, sparsely pubescent: 



under surface piceous; antennae and legs reddish-brown, the club darker. 

 Head coarsely and densely punctate. Thorax more than twice as wide as 

 long, sides broadly curved, apex emarginate ; base Insinuate, twice as wide 

 as apex; disk coarsely and rather closely punctured, with a vague depres- 

 sion each side of scutellum and a distinct oblique one near each hind angle. 

 Elytra together wider than long, with somewhat irregular rows of coarse, 

 close-set punctures. Length 4-5 mm. 



Putnam County: rare. March 6. Taken from under surface 

 of hickory slab. 



1218 (3687). Colastes semitectus Say, Journ. Phil. Acad. Nat. Sci.. V. 



1825, 1S2; ibid. II, 288. 



Elongate-oval, much depressed. Piceous. moderately shining: elytra 

 dull reddish-yellow, narrowly piceous on sides and apex. Thorax one-half 

 wider than long, apex narrower than base, surface coarsely but not densely 

 punctate. Elytra rather densely punctate, the punctures near suture in ill- 

 defined rows. Prosternum very sparsely punctate. Length 3-4.5 mm. 



Lake. Crawford and Posey counties: scarce. May 21-July 3. 



1219 (3689). Colastus truxcatus Rand.. Best. Jour. Nat. Hist.. IT. 1838, 18. 

 Oval, slightly oblong, strongly depressed. Dull reddish-brown: head 



usually piceous. Thorax nearly twice as wide as long, narrowed in front, 

 width of apex equal to length, disk feebly convex ; surface, as well as that 

 of elytra, rather densely punctate. Apex of elytra broadly emarginate- 

 truncate. Prosternum nearly smooth. Length 2-2.: 5 mm. 



