56 PROC. ENT. SOC. WASH., VOL. 24, NO. 2, FEB., 1922 



cone-shaped and somewhat longer than broad at apex; ring-joint small; funicle 

 distinctly 6-jointed, the first funicle joint about twice as long as the pedicel, 

 following joints shorter but each distinctly longer than broad; club scarcely 

 thicker than the funicle joints, about as long as the two preceding funicle 

 joints combined, 2-jointed, the joints subequal; pronotum large, the dorsal 

 portion behind the anterior declivity as long or nearly as long as the meso- 

 scutum, narrowest at the posterior margin, coarsely rugoso-punctate anteriorly, 

 more finely reticulate-punctate posteriorly; mesoscutum and scutellum nearly 

 uniformly rugoso-punctate, some of the punctures more or less rounded and 

 indistinctly umbilicate; propodeum coarsely rugose with a narrow moderately 

 deep, immargined median longitudinal channel, the sculpture within this groove 

 similar to that of remainder of propodeum; forewings reaching nearly to apex 

 of abdomen; marginal vein thick, fully twice as long as the stigmal; postmarginal 

 nearly twice as long as the stigmal, indistinct toward apex; hind coxae reticulate- 

 punctate; abdomen as long as the head and thorax, subcylindrical, slightly 

 compressed, distinctly petiolate; abdominal petiole usually a little broader than 

 long (in one specimen as long as broad), rugosely sculptured; tergites beyond 

 the petiole (except the first which is polished) faintly shagreened; first tergite 

 constituting approximately one-fourth the total length of abdomen; second 

 about one-third as long as first; third and fourth subequal and a little less than 

 twice as long as second; fifth and sixth longer than the second and not as long 

 as the third; ovipositor sheaths slightly exposed at tip. Black; antennal scape, 

 pedicel, all tarsi, anterior tibiae, apices of all femora, and the middle and hind 

 tibiae at base and apex testaceous; all femora except apically, and the middle 

 and hind tibiae except base and apex black or brownish-black; wings hyaline, 

 the venation brownish. Male unknown. 



Full grown larva. Length 7.5 to 9 mm.; width at second segment approxi- 

 mately 1.2 mm. Long, slender, cylindrical, tapering slightly from the second 

 segment to a blunt point posteriorly; on the median line of the dorsal surface 

 are eight more or less prominent, bluntly cone-shaped protuberances each aris- 

 ing at the junction between the segments, the first between the third and fourth 

 segments and the eighth between the tenth and eleventh segments, the first 

 and last usually much smaller than the other six; occasionally a similar process 

 indicated between the eleventh and twelfth segments but this never prominent; 

 spiracles very small and circular; mandibles curved, acute at apex, with or with- 

 out a distinct tooth on the inner margins some distance from the apex. Color 

 pale yellowish white with the mandibles dark brown. Described from 

 specimens in alcohol. 



The larvae live within the young stems and the adults emerge 

 in the spring through small round shothole-like apertures cut 

 in the flattened side of the previous year's growth. 



Mr. Sasscer has supplied the following notes: 



"A number of dead shoots of Phyllotachys which were undoubtedly killed 

 by the jointworms were found in the gardens. Adults were found in living as 

 well as dead branches. Exit holes are most frequently found in dead branches, 

 although some branches which were alive exhibited adults ready to emerge, 



