48 Annals Entomological Society of America [Vol. Ill, 



small and concealed under the 8th abdominal segment. The 

 spiracles arc horny, conical projections placed somewhat abo\-e 

 the lateral line, especially on segment i . The anal spiracles are 

 far larger than the lateral ones, and are of most importance to the 

 larva. They are tinancatcd conical, with four stout spines. Xo 

 young larvae were examined, Ijut Eckel (5) says of the related 

 resinicola: "The tracheal system undergoes no change with the 

 larval growth except the odd development about the anal 

 spiracles." In the young resinicola larva each terminal spiracle 

 is a long horny tube, whereas in full-grown specimens they 

 resemble those of resinicoloides. The 3rd thoracic segment has 

 no spiracles although the tracheal tube is present here and well 

 developed. Eckel has noted this in the eastern species. 



Hairs and Bristles. These may be divided into two classes: 

 (i) longer sparse hairs; (2) shorter numerous bristles. Those of 

 the first class are, as far as could be ascertained, present on all 

 but the supernumerary- segment. On segments 4-10 are two 

 larger hairs situated one below^ the other, the first close to the 

 base of the spiracle. On segment 1 1 , laterally and just below the 

 s]jiracle is a large hair. On segment 1 2 are two apical hairs 

 already referred to. These hairs, commonly near the spiracles, 

 may assist in keeping the latter clear of the soft resin in which 

 the larva lies. 



The bristles* are arranged in transverse rows forming long 

 patches on the dorsal and ventral surface of the body and thin- 

 ning out laterally. Dorsally these bands are on the anterior 

 portion of segments 2, 3, 4. 5 and (), and on the posterior part of 

 segments 8, 9, and 10. The band is heaviest on segment 4 where 

 a blank space cuts out a broad mesal notch on its posterior bor- 

 der. On segments 2 and 3 the band is broad and almost divided 

 by a transverse space, and on segment 5 is further reduced to 

 three patches. The patch on segment 6 is almost obsolete. 

 These bristles point posteriorh' while the sim])le bands on seg- 

 ments 8, 9 and 10 have them pointing anteriorly. 



Ventrally the bristle rows are not broken up but are simple, 

 and are present on the anterior part of segments 2, 3, 4. 5. 6. 7, 8 

 and 9 wlierc tliey point posteriorly and on the posterior portion 

 of segments 4, 5, 6. 7, 8. 9, 10 and i i, where they point anteriorly. 

 These rows pointing forward lliiii out anteriorly, and on seg- 



♦ Illustrated in Ent. News, XX, Jan., 1909, Plate I. 



