BY H. L. SCHRADER. 7 



found, male and female, under the same leaf. (PI. III. 1.) The 

 female gall is in the shape of a pea, but somewhat larger, the 

 male gall, very small and conical. 



The female Opisthoscelis subrotunda (PI. III. n.) is of a crimson 

 red colour, nearly round, but the terminal segment of the abdomen 

 very much tapered ; it has very long posterior legs, but no trace 

 of the anterior and intermediate legs. 



Fig. o. A longitudinal section of a full-grown female gall, 

 with the female inside, (natural size.) 



The male PI. III. m. is of a red colour, with anal setfe, the 

 body, legs, and antennse, are very hirsute ; length about two lines. 



In another species 0. gracilis, which I have observed, the 

 oviparous female is rather slender, and the legs are still longer 

 and thinner than in the species before noticed, and the male has 

 no anal sette. 



The larvifi resemble those of Bracliyscelis, but have very short 

 anal setae. 



In the third genus, which I have named Ascelis, the female 

 larvae alone form galls. PL III. Fig. q. and r. show sections of 

 the gall of A. jp^-cemollis with the full grown female inside. The 

 male larvte undergo their metamorphoses, in the gall of the 

 mother. 



The females, PI. III. p. (magnified), which are of a pale 

 yellow colour, lose nearly all tracas of articulation, becoming 

 fixed masses of animal matter, apparently without life or exterior 

 members. There are only dark spots to be seen, in the places 

 where the feet should be found. But on the back of the animal 

 is situated a horny instrument with three points : Fig. s. This 

 curiously shaped instrument, which always holds some gum 

 between its three points, (as in Fig. t.) seems to serve for closing 

 up the hole or entrance of the gall, to prevent strange insects 

 from entering. 



The opening of the gall is not, as with Brachyscelis, in the top 

 of the gall, but on the other side of the leaf, as Fig. r. will 

 illustrate. 



The larva PI. III. Fig. u. which is flat and of a transparent 

 yellow, resembles that of Brachyscelis, except that it is more 



