NORTH AMERICAN HYMENOPTERA. 307 



situated posterior to the abdominal feet on joints 6-10. Found at 

 Weld Pond, Franklin County, Maine. 



Xeinatus lateralis Norton* (3E). Larva. — Head ratber flat before, green, 

 a black sliade from ocellus eacb side nearly to vertex and narrowly in the sutures 

 of clypeus and median suture to vertex ; ocellus in a black spot; width 1.4 mm. 

 Body leaf-green, rather dark, slightly shining; feet on joints 6-11, 13, small, con- 

 colorous ; segments rather indistinctly 5-annulate, with minute, dark, setiferous 

 dots on two central annulets, most distinct on the thorax and subventrally. Body 

 slightly translucent, tracheae evident, no marks ; anal feet absent, but on end of 

 anal plate a pair of colorless short processes with enlarged ends. 



Last stage. — As before, but a black shade on clypeus ; segments 4-annulate, not 

 shiny, annulets 2 and 3 higher and shiny; no setiferous dots, but minute ])ile on 

 head and thorax ; blackish marks at base of thoracic feet. 



Solitary edge-eaters on white bireh (7>. piqjijrifera), the body not 

 elevated, but bent with the leaf. Found at Plattsburgh, N. Y., and 

 Keene Valley, New York ; also in Central Park and along Riverside 

 Drive, New York City, on B. populifolia. 



Note. — The preceding larvae are all adapted to rest on the edges 

 of leaves. The two following, however, rest flat on the surface, are 

 slightly flattened, and would be taken for species of Selandria at 

 flrst glance. But their number of legs is normal for the Nematids. 



Xeniatus thoracicuN Harrington. 



First stage. — Head round, higher than wide, but not narrowing to vertex ; shin- 

 ing, eye black, mouth brown ; width 0.25 mm. 



Second stage. — Similar; eye surrounded by a black spot: head rather higher; 

 width 0.33 mm. 



Third stage. — Head almost whitish, pale: width 0.5 mm. ; joint 2 small, making 

 the head appear prominent. Body much as in the following stages, but paler. 



Fourth stage. — As in the next stage in all points, but a little paler, though darker 

 than in the previous stage ; width of head 0.7 mm. 



Fifth stage. — Head round, smooth, shining, greenish testaceous, prominent; eye 

 black, mouth brown ; width 1.0 mm. Thorax a little enlarged, the feet spreading 

 widely, not concealed. Abdomen slightly tapering posteriorly, gradually be- 

 coming smaller from the thorax ; feet present on joints 6-11 and 13 ; segments 

 4-anuulate. smooth, without tubercles, not shining; color pale clear green, the 

 alimentary canal showing dark green, or the surface covered with a slight white 

 bloom. Thoracic feet watery greenish ; abdominal ones short, concolorous with 

 the pale subveutral region ; anal plate rounded. 



Sixth stage. — As before ; width of head 1.4 mm. 



Seventh stage. — Head held forward ; light testaceous, faintly brownish, smooth, 

 shining minutely reticulated ; eye black, mouth brown ; width 2.0 mm. ; joint 2 



■•■•Identified by Mr. Marlatt, but doubtfully. He says: "3E does not agree 

 altogether in color with this species, but seems to come closer to it than to any 

 other. . . . Since the original type of lateralis is lost, it may be as well, pei'haps, 

 to describe your specimen as a new species." 



TEANS. AM. ENT. SOC. XXII. SEPTKMBEB, 1895. 



