368 SCOLYTIDJE. [LeConte. 



Club pubescent and annulated on botli sides, outer joints 

 of funicle slightly broader, not fringed ; elytra 

 aculeate at tip MICRACIS. 



Club sparsely hairy, corneous, without sutures on upper 

 surface ; with two indistinct sutures on the lower 

 surface ; outer joints of funicle transversely pro- 

 duced, fringed with long hairs ; elytra not aculeate. THYSANOES. 



MICRACIS Lee.* 



Sutures of club forming narrow curves 2. 



" " broad curves 4. 



' ' nearly straight 5. 



2. Eyes distant beneath 3. 



Eyes contiguous beneath, elytra more finely punctured, 



clothed with very short stout hair 3. nanula. 



3. Elytra nearly glabrous 1. suturalis. 



" clothed with short stout hair 2. aculeata. 



4. Elytra nearly glabrous, with rows of coarse punctures, 



asperate near the tip 4. rudis. 



5. Elytra sparsely clothed with long hair, punctured in 



rows, asperate behind 5. hirtella. 



1. M. suturalis Lee., Tr. Am. Ent. Soc., 1868, 165. 



Illinois, boring in the branches of Xanthoxylon: Dr. Henry Shinier. 

 The club of the antennae is more than one-half longer than wide; the gular 

 space between the eyes is wide ; the punctures of the elytra are fine and 

 arranged in numerous distinct rows ; there are a few short hairs near the 

 tip in some specimens, but in others even these are wanting. Length 

 2.5 mm.; 10 inch. 



2. M. aculeata Lee., ibid. 1868, 165. 



Virginia, one specimen. The antennal club is of the same form as in 

 M. suturalis, and the eyes are as widely separated below ; the elytra are 

 clothed with short sub-erect yellowish hairs, which are slightly clavate ; 

 the punctures are larger and denser than in the preceding, and not ar- 

 ranged distinctly in rows, though owing to the manner in which the short 

 bristles are placed the interspaces are feebly indicated. Length 2.7 mm. ; 

 .11 inch. 



3. M. nanula n. sp. 



Slender cylindrical, much smaller and narrower than the other species, 

 brown ; antennae reddish-brown, with the first joint fringed with long 

 hair ; club but little longer than wide, sutures forming less narrow curves. 

 Eyes contiguous beneath; prothorax one-half longer than wide, nearly 

 opaque, sparsely and finely granulate behind, asperate with small acute dis- 

 tant tubercles in front ; very thinly pubescent, with short erect hair, 

 especially towards the sides. Elytra somewhat shining, feebly and indis 



* I have in the synopsis incorrectly described the i'unicle as 5-jointed. 



