652 FAMILY IV. SCOLYTIDJE. 



Lahawajr, N. J., March 26, on dead and dying pine. (Wenzel.) 

 Described from Tampa, Fla., and Bladensburg, Md. Occurs 

 under bark of Pin us pal list ris in Florida and under that of Finns 

 virginiana near Washington, D. C. The galleries always start 

 from the main gallery of a Tomicus, usually cacographus, rect- 

 angularly or obliquely ; at irregular intervals secondary galleries 

 branch off. Nearly the same size and form as pusilhis, but the 

 latter is at once distinguished by the more shining head and 

 thorax, the very conspicuous large punctures on thorax and the 

 wide elytral intervals. 



II. DENDROCTOXUS Erichson, 1836. (Gr., "tree v + "destroyer.") 

 Club of antennae short, obtuse, sometimes thick and almost 

 globose, sometimes compressed, always composed of closely united 

 knob-shaped joints (Fig. 137, H) ; basal margin of elytra acutely 

 elevated and serrate; third joint of tarsi bilobed, not received 

 in second ; beak very short and thick ; abdomen cylindrical ; tibiae 

 serrate on outer margin; antennae geniculate; head large and 

 prominent, with the median segment of the epistoma produced 

 into a process or protuberance ; anterior coxte almost contiguous ; 

 abdominal sutures 4, 5 and 6 strongly recurved. The species of 

 this genus have been elaborately monographed by Hopkins 

 (1909-a), from whose work the following is abridged. Our treat- 

 ment of the genus is brief, as the reader may easily procure the 

 work referred to, with its wealth of illustration and results of 

 minute study. (Figs. 132, 134, 135.) 



SYNOPSIS OF SPECIES OF DKNDROCTOXUS. 



a. Pronotum somewhat elongate and as broad as elytra, not distinctly 

 narrowed anteriorly; anterior dorsal half of elytra without long 

 hairs; length 2.54 mm. 1053. FRONTALIS. 



'id. Pronotum stout, usually narrower than elytra and distinctly nar- 

 rowed and constricted anteriorly; anterior dorsal half of elytra 

 normally with long hairs, except in terebrans. 

 b. Front usually with posterior impression; pronotum with large and 



small punctures intermixed. 



c. Length 3.5 5 mm.; reddish to brown; elytral declivity with 

 strife deeply impressed; epistomal process narrow, flat, with 

 lateral sections nearly parallel; pronotum with punctures mod- 

 erately regular. 1054. SIMPLEX. 

 cc. Length 4.7 6 mm.; reddish to black; elytral declivity with strife 

 not deeply impressed; epistomal process broad, concave, lateral 

 sections oblique; punctures of pronotum distinctly irregular. 



1055. PICEAPERUA. 



(cc. Length 6.5 mm.; brownish; elytral striae impressed; punctures 

 coarse, interspaces narrow and moderately coarse, acute, ru- 

 gosities coarser toward suture. 1056. PCNCTATUS. 



