<i:M l<'Ai\lll,Y \.\VI. NI'I'IIX H, IDJ'l. 



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. 



a. Hind aiigles of thorax distinct, 

 ft. Scutellum smooth at tip. 

 c. Form broadly oval. 

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



1217. MORIO. 

 tl<l. Thorax without fovea; elytra each with four reddish spots. 



MACULATL S. 



rc. Form oblong, much depressed; elytra dull yellow, the sides and 

 apex narrowly piceous. 1218. SEMITECTUS. 



bb. Scutellum densely punctured; color uniformly piceous. UNICOLOR. 



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



1219. TRUNCATUS. 



1217 (3685). COLASTUS MOEIO Erichs., Germ. Zeitschr., IV, 1843, 242. 



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

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

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

 long, sides broadly curved, apex euiargiuate ; base bisinuate, twice as wide 

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

 sion each side of scutelluni 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). COLASTUS SEMITECTUS Say, Jouru. Phil. Acad. Nat. Sci., V, 



1825, 182; 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. Prosternuni very sparsely punctate. Length 3-4.5 mm. 



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



1 1M9 (3689) . COLASTUS TRUNCATUS Rand., Bost. Jour. Nat. Hist., II, 1838, IS. 

 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. 



