140 
ZOOLOGY: C. T. BRUES 
acute at apex and with a single acute tooth inwardly before the apex; 
at the base they are attached at their inner angle so that when open the 
rectangular outer basal angle extends laterally beyond the head, but 
when closed the basal edge forms an extension of the sides of the head. 
Antennas 12-jointed; scape half as long as the head height; pedicel 
half as thick as long; first three flagellar joints very small, the first tri- 
angular, the others transverse; club six-jointed widest at the base, 
club joints transverse except the last which is oval. Head deeply 
excavated behind on the occiput. Pronotum coarsely reticulate. Meso- 
notum without furrows, but with about nine somewhat irregular longi- 
tudinal carinas. Scutellum convex, reticulate. Post-scutellum with 
a small vertical scale-like protuberance which is emarginate medially. 
Propodeum nearly fiat above, emarginate at the middle on each side 
and with its posterior angles rounded; coarsely reticulate at the cen- 
tre, very finely so at the sides. Pleurae sparsely punctate. Abdo- 
men broadly lanceolate, finely longitudinally aciculated, broadest at 
the apex of the third segment which is a little longer than the fourth; 
first shorter than the second, the two together as long as the third; 
fifth as long as the second, sixth very small. Wings extending to the 
tip of the abdomen; costal vein two-fifths as long as the wing; stigmal 
enlargement well developed, but very light yellow in color; stigmal 
vein very weak, oblique. 
Described from four females received from Walajanagar, North Arcot 
District, South India. 
The form of the mandibles and head is unusual, and may be associated 
with the peculiar habit of traveling on the body of the locust as de- 
scribed on a preceding page. 
1 Washington, Smithsonian Inst., Nation. Mus. Bull, No. 45, 1893. (241). 
^Madras, Mysore State Dept. Agric. Entom.. Bull., (Ser. 2), No. 2 1911, (26). 
^ Since this article was written Dr. Joseph Bequaert has called my attention to a most 
remarkable adaptation of the same kind exhibited by certain Eumenid wasps. In some 
species of Odynerus (e. g., 0. conformis Sauss.) there is a space between the dorsal plates 
of the first and second segments of the abdomen which is regularly occupied by a large 
colony of small mites. This flattened pocket can be opened or closed by the flexion of 
the wasp's abdomen. 
^Bmxelles, Ann. Soc. roy. Sci., 29, pt. 2, 1905, (129). 
