June, 1920.] Ch ANr HF.RLI N : WoOD-BoRING BEETLES. 155 



In addition to Horn's description it is well to note that the thorax 

 is decidedly darker than the elytra, usually hlack. In the male, which 

 is smaller than the female, the antenn?e is more pectinate, wider, a 

 little longer. The thorax is decidedly more narrowed posteriorly. 

 The last ventral segment is elevated at the center into two blunt 

 spines, in much the same manner as certain Scolytidae. These spines 

 are present in both sexes but more highly developed in the male. 

 Dr. Horn gives the length 9-19.5 mm., the latter figure is probably an 

 error. In examining over 100 specimens the smallest was 8.3 mm. 

 and the largest '12. 2 mm. long. (Plate VIII, fig. 3.) 



Larva. Yellowish white, first segment behind head is flattened and 

 broader than the others, second slightly broader tlian third, from the 

 third on the segments are the same size with the exception of the anal 

 segment which is decidedly constricted. In segments 5 to 1 1 the 

 anterior third is constricted; the p'osterior two-thirds more rounded 

 and larger ; length 26 to 29 mm. ; width of first thoracic segment 3.5 

 mm. Mouth parts dark brown or black and well developed. The 

 dorsal and ventral plate of the first thoracic segment is marked by a 

 double '■ TT," dark reddish brown in color, the cross arms of the T's 

 do not touch; the lateral half of each cross arm is thickened, Plate 

 VIII. fig. 5. 



Pupa. The pupa. Plate VII T, fig. 4. is yellowish, slender, 12 mm. 

 long, 3 mm. wide; has the cylindrical appearance of the adult; the 

 head is bent forward on the breast and the appendages are folded on 

 the ventral surface in the same manner as buprestid pupa?. 



Seasonal History. 

 Larvre, pupae, and fully formed adults were found in April. The 

 first adults observed emerged April 16 and the last pupa were found 

 June 2. \\'hat appeared to be full-grown larv;c have been taken in 

 February, April. June. September and November. This would indi- 

 cate that more than one year is spent in the larval stage. 



Life History. 

 No eggs were observed and although larva, pupa and adults were 

 taken from the same tree for three years and hundreds of beetles 

 emerged, no indications of reinfestation of nearby ttees were ob- 



