226 SUBFAMILY X. CURCULIONIN^E. 



Thorax subcylindrical, as wide as long, densely and finely rugose-punc- 

 tate and with an abreviated median carina. Elytral striae deep, coarsely 

 punctate; intervals convex, minutely punctulate. Length 1.2 mm. 



Common throughout northern Indiana; less so in the south- 

 ern portion. May 21 Oct. 31. Frequent near New York City in 

 May and June on duckweed (Lemna) or adhering to boards in 

 water in which the plant is growing. Ranges from New England 

 and Canada to Michigan, south to Florida.. Lake Okeechobee, 

 March 7. Occurs also in Europe, northern Asia and Japan (Ham- 

 ilton}. Breeds in ponds and lakes on various species of duck- 

 weed, the leaves of which the beetle perforates with round holes. 

 Probably occurs wherever Lcmna grows. 



XIV. ONYCHYLIS Lee., 1876. (Gr., "claw" + "small.") 



In this genus the first joint of funiculus is longer and stouter, 

 second short but longer than third, 3 6 gradually a little 

 broader; third joint of tarsus moderately dilated and bilobed, 

 fourth joint narrow, extending beyond the lobes of third. The 

 species resemble those of Bagous but differ in having the articu- 

 lar surface of hind tibite at apex, not on the sides, and in the 

 smaller and more slender tarsal claws. 



KEY TO EASTERN SPECIES OF ONYCHYLIS. 



a. Broadly oval; thorax broader than long. 319. NIGRIROSTRIS. 



aa. Oblong-oval; thorax as long as broad. 320. LONGULUS. 



319 (8567). ONYCHYLIS NIGRIROSTRIS Boh., Schon., 1843, Pt. 2, 184. 



Black, densely covered with a crust of dirty gray scales; elytra often 

 with a faint broad median fuscous blotch; antennae and tarsi reddish- 

 brown. Beak of male as long as thorax, black, shining, naked, finely and 

 sparsely punctate; of female covered with scales to insertion of antennas, 

 beyond that reddish-brown, smooth. Thorax one-fourth wider than long, 

 sides feebly rounded, disc narrowly constricted near apex, finely, densely 

 and deeply punctate. Elytra one-third wider at base than thorax, sides 

 parallel for two-thirds their length, then rapidly converging to the nar- 

 rowed and compressed apex; stria? rather deep, finely and closely punc- 

 tate; intervals subconvex without seta?. Length 2.8 3.2 mm. 



Northern half of Indiana, common ; not taken in tTie southern 

 portion. Apr. 20 May 25. Occurs frequently near New York 

 rity, M;iy December, on arrowhead (Kngittarifi). Lake Tstok- 

 poga and Dvmedin, Fla., Feb. 24 April 16. Swept by hundreds 

 from the flowers and foliage of the pickerel weed, Pontcdcrla cor- 

 flata L., at Dunedin. Ranges from Canada and New England to 

 Michigan, south to Florida and Texas. 



