March 1S97.] 



Dvar: Larv.'e of Saw-Fmes. 29 



Swept from grass at Jefferson, N. H.; also on grass by Mr. L. H. 

 Joutel at Greenwood Lake, N. J. 



Pachynematus pubescens Marlatt. 



Head round, shining, testaceous, eye black; width 1.3 mm. Body 

 pale pinkish brown, a broad addorsal and stigmatal white band. The 

 former borders the dorsal vessel and the pair are separated by the dark 

 blood ; the latter is edged above by a blackish shade. All the lines 

 run from joint 2, but are lost on joint 13, the frass showing as a dark 

 shade. Body slightly shining; segments indistinctly 5-annulate; feet 

 concolorous. 



Found on Carex near the summit of Mt. Washington by Mrs. 



Zella Dyar. 



Pachynematus gregarious Marlatt. 



Eggs. Laid in an irregular group of slits under the lower epi- 

 dermis toward the center of a leaf. The slits are close together and 

 after the larvre emerge remain as irregularly placed, lunate, hollow 

 ridges, elliptical when fresh ; 1 x .5 mm. 



Stage /.—Head blackish brown; width .35 mm. Body colorless. 



Stage //.—Head pale with a black shade across the clypeus and on 



each side nearly to the vertex. Body shining, colorless; the lateral 



outline fluted, food green ; side3 of thorax bulging; tail often elevated. 



Thoracic feet dusky and the sides of the thorax dusky spotted. 



Stage III. Head .5 mm. Much as in the next stages, but the 



black parts brownish and shaded. 



Stage /F.— Head .8 mm. As in the next stage, but the black more 

 diffuse. The black marks on the body are small, but the elevations are 

 present. Thorax enlarged, fluted. 



Stage V. Head i.o mm., rounded, tinted with pale testaceous, 



almost colorless except for a broad deep black band which runs trans- 

 versely across the clypeus over the eyes and turns up posteriorly to the 

 vertex, becoming smoky; mouth brown. Feet on joints 6 to 11, none 

 on joint 12 and scarcely a trace on joint 13, yet the larvae sit flat on the 

 venter on the surface ot the leaf. Thorax a little enlarged ; abdomen 

 slightly tapering, smallest posteriorly. Segments obscurely 4-annulate, 

 the first annulet broad ; pale, whitish, tinged with yellow, translucent, 

 the alimentary canal showing green. On the abdomen on joints 5 to 1 1 

 a row of large round elevated black patches stigmatally and another 

 above the bases of the feet, a little anterior to the middle of the seg- 

 ments. On joint 12 the spots are smaller, absent on joint 13.- On 

 thorax a small lateral spot and a large one above the base of each leg. 



