82 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



24. The feeble oak- borer. 



Goes debilis (Leconte). 



Order Coleoptera; Family Cerambycid^. 



A cylindrical long-horned beetle, which has recently been described 

 by Dr. Leconte under the abov^e name, is so uniformly found upon 

 white-oak trees in July and August that I doubt not its larva is a borer 

 in the trunks of these trees, perforating the wood, probably, in a man- 

 ner similar to that of the marked pine borer, and the worm resembling 

 that in its appearance. This beetle is half an inch long and scarcely a 

 third as broad, of a black color, its wing-covers chestnut red, its surface 

 having a marbled appearance, produced by short prostrate hairs of a 

 dull ocher-yellow color, except on the anterior half of the wing-covers, 

 where they are gray, and are here followed by a tawny brown spot des- 

 titute of these paler hairs. (Fitch.) For a figure and further mention 

 the reader is referred to Hickory Insects. 



25. Goes tigriniis (De Geer). 



This species, according to Adams Tolman (Insect Life, i, 343), "is 

 commonly taken on the oak in Philadelphia," Mr. Tolman, however, 

 does not specifically state that this borer lives in the oak; but we in- 

 sert it under oak borers, as it may yet be found to infest the oak. It 

 is figured and noticed under Hickory Insects. 



26. The brown prioni's. 

 Orthosoma bnuineiim (Forster). 



Order Coleoptera ; Family Cerambycid^. 



The larvfc of this beetle have been found in rotten oak and walnut 

 stumps by Mr. George Hunt, near Providence, but as it is more com- 

 monly met with in pine logs the reader is referred to the account of it 

 given under pine insects. 



27. Unknown longicorn borer from an oak log. 

 (PL XXI, Fig. 3.) 



Larva. — Body of large size, gradually tapering to the peuultimate segment, with 

 three pairs of thoracic legs of moderate size. 



Head small and much rounded. Labrum small and unusually narrow, well rounded 

 ou the front edge. Anteuuai conspicuous, unusually long; second joint very long 

 and slender, longer than the basal one is thick ; third joint minute and acute at tip. 

 Labium very small, squarish ; submentum and meutum both rectangular, broader 

 than long; the ligula narrow, much rounded in front; labial palpi three-jointed; 

 third jointobtuse, as long as the second. Maxillary lobe very broad and rather short, 

 not reaching beyond the end of the second palpal joint. Maxillary palpi three-jointed ; 

 first joint very short and broad, second one-half as thick as the first, the third slender 

 and a little longer than the second. Mandibles much rounded and entire at tip. 



