fi4S FAMILY XXVJ. — NITIDULID^E. 



Tribe VI. IPINI. 



Medium-sized species having the labrnm firmly united with the 

 front of head, the suture more or less distinct; antenna; 11-jointed, 

 club 3-jointed. Three genera compose the tribe, two of which are 

 represented in Indiana. 



KEY TO INDIANA GENEEA OF IPINI. 



a. Body pubescent ; thorax margined at base, slightly overlapping base of 



elytra. ^-^^ Cbyptarcha. 



aa. Body glabrous; thorax not margined at base. XXI. Ips. 



XX. Ceyptarcha Shuck. 1839. (Gr., "hidden + anus.") 



Oval, piceous or reddish-brown species having the labrum in- 

 distinct; prosternum prolonged and plate-like at tip, partly con- 

 cealing the mesosternum. Two species are known from the State. 



KEY TO INDIANA SPECIES OF CEYPTARCHA. 



a. Punctures of elytra in ill-defined rows ; length 6-7 mm. 1248. ampla. 

 aa. I'unctures of elytra all confused; length less than. 4 mm.; sides of tho- 

 rax flattened, those of elytra rather widely reflexed. 



1249. CONCINNA. 



124-S (3752). Chyptarcha ampla Erichs., Germ. Zeitsch., lY. 1843, 356. 



Oval, more obtuse in front. Uniform piceous or dark reddish-brown, 

 sparsely pubescent. Thorax feebly emarginate and but little narrowed in 

 front, margin not flattened, narrowly reflexed, hind angles obtuse; surface 

 rather closely punctate. Elytra gradually narrowing behind, margin nar- 

 rowly reflexed, the tips separately rounded. I^ength (j-7 mm. 



Lake, Marion and Vigo counties; scarce. June 13-September 

 28. Taken in Vigo but once, when a number were found at sap of 

 soft maple in a swamp. 



1249 (3754). Cryptakcha concinna Jlels., Catalogue, 1806, 41. 



Oval. Piceous, moderately shining, sparsely pubescent; margin of tho- 

 rax, two narrow transverse, sinuous bands and a seutellar spot on elytra, 

 dull yellow. Thorax nearly twice as wide as long, sides gradually curved, 

 hind angles rectangular ; surface, as well as that of elytra, sparsely punc- 

 tate and with shoi-t, erect, stiff hairs, tlioso on elytra in seven rows. Ijength 

 2X1-3 mm. 



l\[arion and Putnam counties; rare. ]\lareh 2(VApril 22. Taken 

 by sifting; alsn occurs at sap. 



XXI. Ips Fali. 1776. (Gr., "a worm that eats horn and wood.") 



Smooth, shining black beetles, having the elytra marked with 

 reddish or yellowish simts. They occnr at sap or in decayed fruits, 



