114 Eev. T. A. Marshall's mono;) raph of 



the radius. Thorax broad, robust; metathorax as wide as the 

 rnesothorax. First abdominal segment much dilated posteriorly. 

 Tracheal grooves distinct. Hind coxae punctulato-rugulose. Terebra 

 about equal to « of the abdomen. $ J . Length, 2 — 2| ; wings, 

 3£-4f lin. 



Var. a. Posterior segments of the abdomen rufous or testaceous, 

 with or without a black common patch on the disk. $ ? . 

 Common. 



Var. /3. Entirely black above except the face, orbits, scutelrum, 

 and 2d abdominal segment ; this last is nearly filled up by a trans- 

 verse fuscous fascia. Two males. 



Var. y. Like the last, but the sutures and central space of the 

 rnesothorax are rufous. One male. 



Var. 8. Occiput black ; rnesothorax rufous with black sutures ; 

 metathorax rufous at the sides. One male. 



Var. e. Metathorax and tips of the hind femora slightly infus- 

 cated ; abdomen rufo-testaceous, 2d segment flavo-testaceous. 

 Wesmael. 



Head narrower than the large gibbous thorax ; face subquadrate, 

 somewhat rugulose transversely. Mandibles and palpi flavo- 

 testaceous. Antennae $ ? filiform, 29 — 31 -jointed ; in the J as 

 long as the bodjr, testaceous nearly to the middle, each joint annu- 

 lated with fuscous, thence to the apex gradually darkened ; in the 

 J longer than the body, the flagellum to a greater extent, or 

 entirely, fuscous. Mesothoracic lobes prominent, forming (as seen 

 frorn above) with the scutellum, 4 equidistant shining tuberosities; 

 praescutellar fovea crenate. Furrow of the mesopleurae broad, 

 shallow, rugoso-punctate. Metathorax broader than usual, convex, 

 densely reticulato-rugose, abruptly sloping behind, and there exca- 

 vated. Abdomen as long as the head and thorax, and at its widest 

 part somewhat narrower than the latter ; segment 1 forming more 

 than f of its entire length; tubercles post-medial; regularly 

 striated ; petiole dilated at the extreme base, and often rufous ; it 

 begins to dilate again before the tubercles, and is gradually widened 

 to the apex, which is about 4 times wider than the base ; tracheal 

 grooves large and deep. Stigma dark brown, margined with pale 

 colour on its costal edge, and with its two angles paler; but the 

 border is sometimes confused more or less with the fuscous disk. 

 Ground colour of coxae and legs flavo-testaceous : femora and tibiae 

 rufescent in the middle ; tarsi pale ; claws fuscous. 



Described from 18 females, 24 males. A common 

 species, and singularly omitted by Haliday, unless per- 

 haps it is included in some of his varieties of pendulator 



