(540 FAMILY IV. SCOLYTID.K. 



1031 (9112). IPS CVELATUS Eich., 1867, 402. 



Elongate, cylindrical. Blackish-piceous, antennae and legs ferrugin- 

 ous-testaceous. Thorax cylindrical, closely rugosely punctate behind, 

 median line smooth. Elytra deeply punctato-striate, punctures dilated, 

 intervals rugose, apex almost circularly retusely truncate, margin of ex- 

 cavation crenulate, with three denticles about middle. Length 2.5 3 mm. 



Tompkius Co., X. Y. ; April 26. Pocono Lake, Pa. ; Aug. 9. 

 (Wcnzcl.) Canada and United States south to West Virginia. 

 Food plants, Finns, Plcea, AMcs. Common under pine bark in 

 Florida. Placed in A'i/1el>oru$ by LeConte. 



1032 (9133). IPS AVULSUS Eich., 1867, 402. 



Subelongate, small, cylindrical, glabrous. Thorax oblong, sparsely 

 finely punctate behind. Elytra deeply punctato-striate, intervals moder- 

 ately convex, smooth; apex circularly retuse, subexcavate, with four tuber- 

 cles on each elytron, the uppermost minute, second, third and fourth 

 conical, almost equal, apical margin thinly elevated. Length 2.5 mm. 



Tybee Island, Ga. ; June 24. North Mt, Pa. (Wcuzcl.) Dis- 

 trict of Columbia. Dimedin, Fla. ; April 13. A common species 

 infesting pine in Southern States. 



Tribe III. CORTHYLINI. 



Pronotuin and elytra without scales, commonly glabrous or 

 sparsely pubescent; abdominal sternite 7 with posterior margin 

 rarely rounded ; anterior tibia broader toward apex or serrate on 

 outer margin; pronotum with anterior dorsal area commonly 

 rugose; head concealed from above; anterior tarsi with joint 3 

 simple. (Fig 139, r. 



SYXOPSIS OF GEXERA OF CORTHYLIXI. 



a. First palpal joint cylindrical, glabrous. 

 b. Apex of elytra emarginate; funicle 2 -jointed. (Fig. 137, B.) 



I. MOXARTHRUM. 



&&. Apex of elytra usually rounded. 



c. Funicle 1-jointed. II. CORTHYLUS. 



cc. Funicle 5-jointed. III. GXATHOTRICHUS. 



aa. First palpal joint swollen, hairy; funicle with four to five joints. 



IV. XYLOTERUS. 



I. MOXARTHRUM* Kirsch, ISGfi. (Gr., "single" + "joint") 



The species of Moitrirtltrinn are included by Hubbard (1897) 

 in his account of Ambrosia beetles. The sexes are alike, and 

 males assist females. The young are raised in separate pits, the 

 galleries extending deep into the wood. Eggs are deposited singly, 



*Pterocyclon Eich., 1868, though proposed because description referred to Corthylus 

 (see B. E. Z. XII, 276) is treated by Hopkins as a synonym. 



