WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. 83 



times as long as wide; the 2d joint i shorter; the rest very slowlj shorter 

 and shorter. Thorax opaque, finely and confluently punctured, less so on 

 the mesonotum which is subpolished. Parapsidal grooves acute and im- 

 pressed on the anterior §, with a subobsolete dorsal stria between them. 

 Metathorax with the lipsand the cross-carinae of its lateral areas distinct; 

 the central area large and pentagonal, with its sides indistinct, and con- 

 fluent behind with the posterior area; the basal area obsolete. Tegulse, 

 and a short line under the front wing, white. Abdomen rufous with the 

 basal I of joint i black, elongate-oval, about 7 times as long as wide, sub- 

 polished and almost microscopically sculptured. Joint i rather robust, 

 twice as long as wide, i wider at tip than at the extreme base, its sides 

 gently concave § of the way to the tip where the spiraculiferous tubercles 

 are placed, thence subparallel. Joint 2 longer by \ than wide, and | wider 

 at tip than at base; 3 scarcely longer than wide; the rest gradually shorter 

 and shorter. Venter rufous ; veins black. Legs rufous. The 4 front legs 

 with their knees white, and their coxae and basal trochanters white below 

 and black above; the 2d trochanter in the front legs white below. Hind 

 legs with their coxae, the whole of their basal trochanters, and the base of 

 their second ones, black ; and the tip of the tibiae and the entire tarsi fus- 

 cous. Wings subhyaline, tinged with smoky yellow; veins and stigma, 

 black; radial area elongate, its posterior angle 135°. Areolet with its. 

 inner and outer sides the longest, and its anterior side \ shorter, the z 

 posterior sides subequal and of intermediate length. First recurrent 

 vein angulated at 135°, with a stump of a vein at the angle; second 

 recurrent vein distinctly angulated. Length ^ .36 inch. Front wing d* 

 .26 inch. 



One c? ; 9 unknown to me. Might be taken for the S of ;per' 

 similis^ Cress., but for the white (not dark) mandibles, palpi and 

 tegulse, the coloration of which parts is not a sexual character in 

 this family. Moreover, the antennae are proportionally too stout 

 and the abdomen too slender. The same characters separate it 

 from the other 5 9 belonging to this group, and from the c? c? it 

 is separated at once by the presence of white markings on the 

 head and the absence of them on the tarsi. The ornamentation 

 of the coxae and trochanters is very like that of Cr. (^Ischnus) 

 albitarsis^ Cress., which belongs to Section 3, but the abdomen 

 is not near so slender. 



B. — Antennae not annulate with -white. Coxce and trochan- 

 ters not marked at all with black. 



CryptUS Ultimus, Cress.— $.— The head is subopaque and very mi- 

 nutely and closely punctate. The ist joint of the flagellum is 4 times as 

 long as wide, with its membranous base rufous ; the 2d joint i shorter ; the 

 rest gradually shorter and shorter. The parapsidal grooves of the thorax 



