356 SCOLYTID.E. 



[LeConte. 



like the elytra. It varies much in size, one specimen from Florida being 

 scarcely larger than H, eruditus. Length 1-1.5 mm.; .04-. 06 inch. 



This is probably Stephanoderes seriatus Eichhoff, Berl. Ent. Zeitsch. 

 1871, 133; but the head is not retracted into the prothorax. There are 6-8 

 small teeth on the apical margin, just as in H. eruditus. 



2. H. erectus, n. sp. 



Elongate-oval, rather robust, brown, thinly clothed with short pubes- 

 cence, which is stout and erect especially near the tip of the elytra. Head 

 large, exserted, opaque; with a somewhat sericeous lustre from extremely 

 minute striae ; front flattened. Prothorax not longer than wide, very 

 convex, rough in front with a few large acute elevations, general surface 

 finely punctured. Elytra blackish, with lightly punctured strke becoming 

 deeper towards the sides. Antennae and legs yellowish. Length 1.7mm. ; 

 .07 inch. 



Two specimens, Texas ; Belfrage. This species closely resembles the 

 next, and only differs by the shorter and stouter hairs of the elytra, which 

 are almost as in H. eruditus. There are not more than ten or twelve acute 

 tubercles on the front part of the prothorax ; and there are two small 

 approximate teeth on the apical margin itself. 



It is quite possible that this is Stephanoderes Chapuisii Eichhoff, Berl. 

 Ent. Zeitschr. 1871, 132 ; but the head is not retracted into the prothorax,. 

 as required by the generic description. 



3. H. dissimilis. Crypturgus diss. Zimm., Trans. Am. Ent. Soc., 

 1868, 144. 



Lake Superior to Georgia. Larger and stouter than the preceding, with 

 the pubescence longer and finer ; the apical margin of the prothorax has- 

 two approximate erect teeth. I observe no sexual differences in the seven 

 specimens examined. Length 2 mm.; .08 inch. 



The size and specific characters agree moderately with those of Crypha 

 lus robustus Eichhoff, loc. cit., 1861, 130. 



4. H. striatus GrypJialus str. Lee., Trans. Am. Ent. Soc. 1868, 156. 

 Califorma7~Lower and Upper, and Illinois. Resembles somewhat, in 



appearance, the Azorian genus Liparthrum, but differs by the tarsi having 

 the joints 1-3 equal and distinct. 



(^. Head punctured, with a large transverse frontal elevation. 



9 . Head punctured, with a small round frontal fovea. 



Group II. Xyloteri. 



The insects of this group are rather robust and cylindrical ; the declivity 

 of the elytra is oblique, not excavated and not toothed. The eyes are 

 completely divided, and the club of the antennae is oval, solid, pubescent 

 on both sides, and not annulated. The tibiae are broad, rounded at tip, 

 and serrate on the outer and terminal edge. The tarsi are slender, the 

 fourth joint small, as usual, and the fifth long, with simple divergent 

 claws. The species bore deeply into the wood of the trees they attack, 

 thus injuring the timber much more than the subcortical Tomici. 



