NORTH AMERICAN HYMENOPTERA. 311 



*Strongylogaster piiiguis Norton. 



Egg. — Laid in nearly circular saw-cuts under the upper epidermis in the middle 

 of the leaf. 



First stage? — Head as in the next stage, but the clypeus entirely black ; width 

 .35 mm. (probably an error; .5 is the calculated width), smooth, annulate, the 

 poinds on joint 2 indicated ; subventral region a little scalloped ; color pale green- 

 ish, food giving a darker shade. 



Second stage f — Head conical, high, the apex curiously pointed, blackish brown, 

 pale below; eye black ; width .6 mm. (= .7?). Thorax a little enlarged, subven- 

 tral region protruding, fluted, applied close to the leaf; segments obscurely an- 

 nulate ; feet on joints 6-13 ; pale green, with an olivaceous tinge, not shining, 

 the whole dorsal region blackish, defined at the lateral edge : a pair of colorless 

 elevated flaps in place of the cervical shield ; small black anal points. 



Third stage. — Head conical, round-pointed at the apex, sutures indistinct ; ma- 

 hogany red. pale around tlie mouth ; ocellus black ; width 1.1 mm. (=: 1.0 mm. ?). 

 Two conical processes on the first annulet of joint 2 and a single median one just 

 behind them on the third annulet of 2. On joint 13 a small subdorsal point and 

 four .such on the edge of the segment posterierly ; subventral folds fluted, with 

 pointed concolorous tubercles ; segments obscurely 7-annulate with indications of 

 pointed tubercles snbdorsally; color not shining, yellowish olivaceous from the 

 food showing through the pale yellowish body ; a defined black lateral line, be- 

 ginning on joint 2 behind the points and ending on joint 13 behind the points 

 there. 



Fourth stage. — Head 1.4 mm.; segments 6-annulate ; subdorsal points on the 

 second and fourth annulets and six on the subventral fold are distinct; otherwise 

 as before. 



Fifth stage. — As before; width of head 2.0 mm.; a blackish cloud at the apex 

 of head. 



Sixth stage. — Of the same shape as before, but without any tubercles, all shining 

 sordid yellowish in color without marks. Head a shade more reddish than the 

 body ; width as before. The folds of the body have a tarry-brown shade. In 

 this stage the larvse do not eat, but enter the ground to form cells for hibernation. 



On the birch and linden at Keene Valley, N. Y. The larvje sit 

 flat on the venter on the surface of the leaf, solitary ; also on the 

 birch, sugar pliun and maple at Jefferson, Highlands, N. H. 



These curious larvae are very unlike most Stron.gylogaster larvae. 



Strongylogaster abiiorinis Provancher. Larva. — Head whitish, upper 

 half gray, except posteriorly ; a brown band over the clypeus between the eyes; 

 eye in a black spot ; width 1.2 mm. Body segments 6-annulate, smooth, not 

 shining; dorsal area above .spiracle, except on joint 13, leaf-green ; a dorsal and 

 lateral gray shade, the latter bounding the green area, often faint or absent ; sub- 

 ventral region and venter whitish ; joint 13 dorsally pale green, contrasting. 

 Thoracic feet moderately large, pale; abdominal ones on joints 6-13; antennse 

 distinct below eye, pale ; minute white points are situated on the second and 

 fourth aunulets, one in the anterior row and two in the posterior above the stig- 

 matal line, then two points below it and smaller ones on the snbstigmatal folds. 



Last stage. — Head shining, pale, the upper half and clypeus brown, the marks 

 cut in a reticulate manner with fine pale lines. Body shining, without points, 



TRANS. AM. ENT. SOC. XXII. SEPTEMBER. 1895. 



