l6a TRANS. ST. LOUIS ACAD. SCIENCE. 



verse head, a short ovipositor, and normal tibiae and tarsi d" $. 

 He was unacquainted with c?, and therefore of course failed to 

 recognize the singular sexual differences in the tarsi. Cresson, 

 on the other hand, as well as Say, entirely overlooked the twisted 

 4 front tibiae and the short 3d and 4th tarsal joints of the 2 . 



Labena grallatOr, Say {j= Mesochotus fuscipennh, Brull^). — $. — Ru- 

 ifous. Head polished and glabrous; face and clypeus opaque, with rather 

 •coarse, transverse rugae ; the foveai at the tip of the face rather small and 

 indistinct. Clypeus with its base in a circular arc of 60°, its tip in a cir- 

 •cular arc of 120°. Orbits, especially in front, tinged with yellow; tip of 

 the mandibles black. Antennae | as long as the body; the flagellum with 

 its extreme base and tip slightly tapered, its ist joint 2 J times as long as 

 'wide, the 2d shorter by J, the rest very slowly shorter and shorter. The 

 'third \ of the flagellum tinged with yellow, the terminal \ with black. 

 Thorax subopaque, finely and confluently punctured, the disk and hind 

 edges of the mesothoracic pleura glabrous and polished. Metathorax 

 \vith the basal area subquadrate, the central area hexagonal and ^ longer 

 and wider than the basal area with its posterior sidfe sometimes indistinct, 

 the lateral areas strongly constricted by their cross-carinze and open be- 

 hind, so that the posterior area is almost obsolete. Tegulae, a line under 

 the front wing, both scutels and the areas on either side of them, a longi- 

 tudinal line on each side of the mesonotum, a line under the humeral 

 «uture, the hind part of the metathorax and the anterior edge of its pleura, 

 all tinged with yellow. Many of the sutures, both above and below, 

 stained with black. Abdomen glabrous and polished at base, subopaque, 

 vrith very minute, dense punctures towards the tip. Joint i, 3^ times as 

 long as wide, 2\ times as wide at tip as at base, its sides straight for \ of 

 the way to the tip, thence with the usual tubercle, immediately behind 

 ■which they are slightly constricted and thence to the tip very gently con- 

 vex. Joint 2 longer by ^ than wide and shorter by § than joint i. Ex- 

 treme tip of joint I, and obsoletely so of one or two of the following joints, 

 j^ellow ; the sutures toward the base of the abdomen blackish. Venter 

 reddish-brown except at tip, the tip of joints i and 2 tinged with yellow. 

 Ovipositor § as long as the body, rufous, its tip black; sheaths yellowish 

 rufous, their tips black. Legs with the tarsi and especially the tibiae 

 tinged with yellow. Front tarsal joints proportioned as 14, 7, 2, 2, 7 ; 

 middle tarsal joints as 14, 4, 2, 2, 12; hind tarsal joints as 14, 7, 2, 2, 9. 

 Wings shining umber brown, with their extreme base and an ill-defined 

 doud reaching from the base of the stigma to the hind edge of the 2d cell 

 of the limb, hyaline; hind wings with the postcostal space and some- 

 times also with an elongate discoidal cloud, hyaline. Veins black; stigma 

 rufous, 4^-5 times as long as wide. Areolet large, rhomboidal, with the 2d 

 recurrent vein entering it slightly beyond the middle, and with its anterior 

 angle slightly truncate. Bullae all distinct, large, white, and encroaching 

 on the brown membrane of the wing. Length $ .76 (.60 BruUd^ inch. 

 Front wing $ .64 inch. Ovipos. .53 (.43 Brull^) inch. 



