WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. S3 



times as long as wide ; the 2d joint i shorter ; the rest very slowly 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 5, with a subobsolete dorsal stria between them. 

 Metathorax with the lips and the cross-carinas 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. Tegulre, 

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

 basal I of joint 1 black, elongate-oval, about 7 times as long as wide, sub- 

 polished and almost microscopically sculptured. Joint 1 rather robust, 

 twice as long as wide, \ 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 4 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 coxa; and basal trochanters white below 

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

 legs with their coxa;, 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 2 

 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 1 

 .26 inch. 



One 6* ; 9 unknown to me. Might be taken for the 6" of fer- 

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

 tegulai, 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 ? ° belonging to this group, and from the d 1 6* 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. — Antenna not annulate 'with -white. Coxce and trochan- 

 ters not marked at all zvith black. 



CryptllS ultimus, Cress.— $.— The head is subopaque and very mi- 

 nutely and closely punctate. The 1st 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 



