360 Dr. A. S. Packard, Jr's Revision of the 



ably broad and fusiform, the joints being greatly expanded, broader 

 than long, and produced on the outer edge in front, so as to be sinuate, 

 beneath very convex, 4 terminal joints cylindrical, short, the termi- 

 nal one being scarcely two-thirds longer than broad. Thorax slender, 

 but anteriorly punctured much as in T. cribreHifef. Propodeum with 

 the enclosure more distinct than in the preceding species, the mesial 

 longitudinal furrow obovate, with a lateral net-work of large sub-pen- 

 tagonal fossae ; entirely black, no yeliow spots whatever. Fore tro- 

 chanters long, black, yellow at tips, with no terminal spines ; femora 

 long, broadly dilated, especially behind, with a long expansion termi- 

 nating in a long thin hook, and a basal spine opposed to it ; yellow, 

 with black basal spot ; tibia? expanded into an exactly semicordate con- 

 cavo-convex plate, the outer half being exactly straight, as the convex 

 edge is revolute beneath, while the inner side is convex, especially to- 

 wards the base, and slightly sinuate, narrowly triangular in its general 

 form, base half as long as the sides, basal half expanding out on to the 

 femora ; yellow on basal half; throughout thickly dotted, seive-like, 

 with fine transparent dots arranged in fine lines near the base; tai-sal 

 joints unusually well developed, basal joint three times as long as the 

 remainder, widening towards the broadly truncated tip, convex beneath; 

 3rd joint developed iuto a broad hainule much as in T. latipes; joints 

 very broad and short, flattened, with a long spinule externally. Middle 

 legs entirely yellow, only the trochanters striped with black above; 

 posterior pair of same proportion between the length of the joints and 

 tarsi as in T. latipes, but the joints are a little slenderer. Hind tro- 

 chanters black, femora black, tibia? yellow, with an ovate black spot on 

 both the outer and inner side ; spines on the terminal joints of tarsus 

 fuscous. 



Abdomen very long and slender, arcuate; basal joint long and slen- 

 der, with broad and arcuate fascia?, either united, or a little separated; 

 followed with two succeeding rings by remote, ovate, minute fasciae, as 

 in T. latipes ; on the 4th ring they are narrow, transverse, excavated 

 on each side of the median line of the body on the front edge, where 

 T. latipes has them bideutate ; on 5th ring are slight remote fasciae. 

 Beneath black, edges of rings piceous, as usual. 



Length of body, .42; head and thorax, .19; abdomen, .23 inch. 



Brunswick, Maine, taken in August on flowers of Spiraea alba. 



Easily recognized by its very broadly dentate antenna?, the short 

 head, retreating rapidly behind, the prominent eyes, the entirely yellow 

 scape, immaculate thorax, and acutely triangular, semicordate, tibial 

 expansion, the well-developed tarsal joints, the two yellow posterior 

 pairs of legs, wherein it differs from its nearest ally T. cribrellifer. 



