ruii'.i: xv. c L EON i XL 



337 



Starke Co., Ind., rare; June 7. The more strongly punctate 

 beak and more closely placed punctures of elytra easily distin- 

 guish this from iniixciiliiN. The type was from Ohio. 



505 (8498). Lixus CONCAVUS Say, 1831, 14; ibid, I, 275. 



Elongate-cylindrical, robust. Black, sparsely and evenly clothed with 

 very short, fine, ash-gray pubescence, and when fresh thickly covered with 

 a rust colored pollen: antennae and tarsi reddish-brown. Beak finely and 

 densely punctate. Thorax slightly wider at base than long, sides feebly 

 rounded, distinctly constricted near tip, converging from basal third to 

 apex; disc sparsely and rather coarsely punctate, the intervals between the 

 punctures very finely punctulate, and with a large, gradually deeper 

 medial impression extending from near apex to base and continuous with 

 that of elytra. Elytra long, sides parallel for four-fifths their length; disc 

 with rows of small, somewhat distant punctures; intervals finely and 

 densely punctate. Length 1013.5 mm. (Fig. 90.) 



Common throughout Indiana, more so in the southern coun- 

 ties; March 10 August 2. Occurs, especially on the curled or 

 sour dock, liinnc.r ci'ixjtus L., mailing May 2!); also on the arrow- 

 arnm, I'cltoinlnt rir</iicd L. Common near New York < 1 ity. May 

 to September. Ranges from New England to Idaho, south to 

 Louisiana and Florida. Breeds in the stems of dock, sunflower 

 and thistle, the pupal cells being made in the stems just below 

 the surface of the earth. Known as the "rhubarb curculio," as 



a 



Fig. 90. Li.rtts coHcai'iis Say. a, Beetle; b, egg; c, newly hatched larva: 



d, full grown larva; c, pupa: /, last abdominal segments of pupa. 



All X 3- (After Chittenden. > 



the adults, according to Chittenden (1000, <il), often attack and 

 puncture holes in the stems of rhubarb or pie-plant, RJtcinii 

 rltd/toii/iciiiit L., causing the juice to exude and the stem to die. 

 Eggs are often laid in these holes, but the larva' there hatched 

 tail to mature. The adults hibernate, mate in early spring and 



