TRIBE III. CORTHYLINI. 643 



1036 (11,241). COBTHYLUS COLTJMBIANUS Hopk., W. Va. Agr. Exp. Sta. 

 Bull. No. 36, 1894, 313. 



Differs from punctatissimus by head of male being raintly and 

 sparsely punctured in front, elytral declivity of male and female provided 

 each side with small tubercles, suture elevated; middle and hind tibiae 

 with four teeth near tip. In punctatissimus the head of male is deeply 

 and coarsely punctured in front; declivity of elytra plain; middle and 

 hind tibiae with only three teeth near tip. Male antennal club without 

 spine. Length 4 mm. 



Recorded from West Virginia, A 7 irginia, Michigan and Massa- 

 chusetts. The type was from sapwood of living white oak ; found 

 also in chestnut oak, tulip, maple, basswood and beech. Hopkins 

 found evidence of injuries in a tulip log, apparently caused by 

 this species, which, according to the number of annual rings 

 formed over the entrance, were produced 13 years before Colum- 

 bus discovered America.* 



1037 (11,240). CORTHYLUS SPINIFER Schwarz, Proc. Ent. Soc. Wash., IT, 

 1891, 114. 



The male differs from the male of punctatissimus by the retuse ely- 

 tral declivity (simple in punctatissimus) margined at apical third and 

 provided each with three small tubercles; by the antennal club with three 

 sutures (two in punctatissimus) of which the two outer are curved and 

 armed with a long curved spine. Length 2 mm. 



Male found April 19 in semitropical hammock at Key West, 

 Fla. Female unknown. Food plant, Quercus. 



III. GNATHOTRICHUS Eich., 1868. (Gr., "mandible" + "hairy.") 



The males are distinguished from the females by the stronger 

 development of tubercles or teeth at end of body. The young are 

 raised in cradles as in Monarthrum, having been found by Asa 

 Fitch in pine wood in 1857. Hopkins also found them in West 

 Virginia in pine, entering green sap wood at base of stumps and 

 dying trees, causing pin-holes and bluing. 



1038 (9060). GNATHOTRICHUS MATERIARUS Fitch, IV, 1858, 40. 



Elongate, cylindrical. Shining brown, base of elytra paler; head and 

 under surface black; antennae and feet yellow. Front somewhat im- 

 pressed, thickly punctured, hairy. Pro thorax long, finely tuberculate in 

 front, smooth behind. Elytra very smooth, with scarcely visible rows of 

 punctures, rounded behind, without tubercles, th<e posterior declivity not 

 retuse, thinly clothed with short yellow hairs. Male, head with elongated 

 longitudinal elevations in front, ending in an acute point just above base 

 of mandible. Female, antennae with long hair and bristles as in retusus; 

 head smooth and sparsely punctured. Length 3 mm. 



*Proc. Ent. Soc. Wash., Ill, 107. 



