288 STATE HORTICULTURAL SOCIETY. 



latter are nearly white except a black annulation at the union of the joints. 

 The hairs on the antennae, especially on the three branches, are more 

 numerous and longer in the males than in the females. The anterior and 

 middle legs are lighter colored in the males than in the females. The 

 anterior femora are nearly all white, and the middle one dusky. A promi- 

 nent spur near the end of the middle femora marks both sexes. 



The abdomen is much narrower and smaller in the male, and the yellow- 

 ish spot on the first segment is much abbreviated. The length of the male- 

 is a little less than two mm. Described from several specimens. 



A UNIQUE PARASITE. 



The past summer, 1890, a new rustic bridge was built over the small 

 brooklet that cuts across the college campus. The railings of this bridge 

 were made of American larch or tamarack. About July 20, these tam- 

 arack timbers were found to be full of nearly mature grubs of two species 

 of bark beetle: Polygraphias rufipennis, Kirby, and Dendroctonus similis,. 

 Lee. We not only reared a large number of both species of these beetles, 

 but also a number of most interesting parasites, which are very unique in 

 form and proportions, and wholly unlike anything else in our collection. 



I have not the description of the genus or the unique Chalcid, but I am 

 indebted to Prof. L. O. Howard for the generic determination, and also for 

 the information that there are no American species of the genus described- 



HEYDENIA UXICA, N. SP. — MALE. 



Color, dark metallic blue, with brassy or 

 purplish reflection. Nearly every portion 

 beautifully reticulated, sparsely covered 

 with short hairs. Head (Pig. 11) broad, 

 vertex broad from before back. A V-shape 

 groove with the angle above extends from 

 the base of antennae toward the vertex, and 

 reaches to near the anterior ocellus. The 

 clypeal suture, and the sutures separating 

 the g*enae from front, distinct. Area close 

 about mouth, yellowish brown. Ocelli and 

 eyes intense black ; the latter elliptical in 

 form. Antennas black, hairy, and long r 

 Antenna? of male. reaching to the end of the thorax. ( 1 hey 



are too short in the figure.) The scape is yellowish beneath, and 

 is as long as the head from the jaws to the vertex. The second 

 joint of the antennas is short, the third very short, the fourth is nearly 

 as long as the scape. The following joints shorten to the seventh. 

 The remaining joints — eighth to thirteenth — are subequal and form a 

 slight club. Thus the antennae are slightly clavate. The jaws are black, 

 palpi long, dark, and hairy. 



The prothorax is very long, half as long as the mesothorax and meta- 

 thorax together. It is broadest in front, narrows abruptly to join the head, 

 and is excavated on the sides, looking like a concave roof, the ridge being 

 quite broad. It is purplish blue above, and lighter beneath. The mesothorax 

 is broad, prominent, parapsidal grooves distinct; lateral lobes prominent, 

 scutellum large and very convex; mesothorax hardly as broad as the- 



