1880.} 405 [Patton. 
The species presents many structural peculiarities, and consti- 
tutes a distinct section in the genus. The basal segment of the 
abdomen is not nodose, but is short and broad, gradually increasing 
in size from the base to near the apex. In the male there is a stout 
recurved tooth on each side of the breast, and in the female the 
median lobe of the clypeus is not produced, but is more convex than 
in the male, and the side lobes are clothed with a silvery pubescence, 
which forms a fringe on the margin corresponding to the ‘ mous- 
tache ” of the male. The side lobes of the clypeus are small, sub- 
orbicular, separated from the median lobe by a short suture, and hav- 
ing a slightly oblique suture above. In the male the margin of the 
clypeus is narrowly and slightly produced, the apex slightly bisin- 
uate; in the female the margin is more broadly and less suddenly 
produced, and the apex is less distinctly bisinuate. The labrum is 
black, its form is described above. The mandibles of the female are 
expanded on the middle of the inner border, the distal portion of 
the expansion the greatest and separated from the apex of the man- 
dible by a large triangular notch, the inner face of the expansion 
armed with three short teeth. In the male the mandibles have on 
the inner margin a broad sharp tooth corresponding to the expansion 
of the female. The eighth ventral segment of the male is broadly 
emarginate at the tip and sometimes advanced beyond the dorsal 
area. The sixth ventral segment of the female has a deep and 
broad sinus at the tip. The marginal cell and the wings as a whole 
are often shorter than is usual in the genus. 
With regard to the preceding paper, page 368, by Mr. 
Crosby, Dr. Wadsworth remarked that Mr. Crosby had 
evidently misunderstood certain of his objections raised 
in the former discussion, and further, that in his view 
nothing shown or advanced concerning the Brighton 
locality calls for any modification of his former state- 
ments. 
¢ 
The Secretary announced the award by the Council of 
the Walker Grand Honorary Prize for 1879 to Dr. Joseph 
Leidy, of Philadelphia, for his prolonged investigations and 
discoveries in Zoology and Palaentology. The amount 
awarded was $1000. 
