RILEY NOTES ON NORTH AMERICAN MICROGASTERS. 305 



larger areas bj regular ridges, two of these ridges enclosing a median 

 ovate-lanceolate area, there being no median carina. Abdomen as long 

 as the thorax, narrowing towards base ; basal joint, excluding the less 

 chitinized sides, longer than broad, and longer than the second and third 

 joints taken together, delicately sculptured and with some scattered punc- 

 tures of larger size; remainder of the abdomen smooth; second joint 

 very short, separated from the third by a deep, but very narrow groove; 

 the third joint twice as long as the second. The ovipositor exserted and 

 as long as the abdomen. The vein from the stigma forms with the basal 

 vein of the areolet only a slight curve. 



Described from many specimens bred from larvse of Mega- 

 thymus yuccce received from South Carolina. The cocoons are 

 spun in white masses, filling the silk-lined burrows of the Yucca- 

 Borer. The flies appear in April shortly after the time of appear- 

 ance of the butterfly, and are more or less powdered with the 

 waxy secretion of the caterpillar. 



The long ovipositor must be of service in enabling this spe- 

 cies to attack its host through the lining of the burrow ; and 

 it is worthy of note that a smaller species {Ap. carpatus Say) 

 which I have bred, in Illinois, from the larval-cases of the Carpet- 

 moth {Tinea tapetzella L.) likewise has an ovipositor as long as 

 the abdomen, and that M. gelechice^ which must pierce the walls 

 of the gall inhabited by its host, also has an exserted ovipositor, 

 as have also an Apanteles bred from the larva of Gelechia cer- 

 cerisella Cham., which folds the leaf of Cercis canadeizsis, and 

 the following species bred from the larva of Caccccia scmiferana 

 (Walk.) which folds the leaf of the Box-elder {Negundo aceroi- 

 des). A group of small species parasitic upon leaf-miners also 

 have a slightly exserted ovipositor. 



Apanteles cacgeci.e, n. sp. — Length of body 3 mm. c??. Black; 

 palpi whitish, tip of mandibles sometimes testaceous, antennte piceous; 

 legs black, the anterior pair from middle of femora and the basal half of 

 posterior tibiae testaceous; wings hyaline, stigma piceous, nervures testa- 

 ceous. Antennte of female as long as the body, of male longer than the 

 body. Mesonotum shining, the punctures shallow; metathorax and two 

 basal joints of abdomen with larger, very shallow punctures ; remainder of 

 abdomen smooth. Abdomen as long as the thorax; basal joint, excluding 

 the less chitinized sides, longer than broad and longer than the second 

 and third joints taken together ; second joint very short, being only half 

 the length of the third. Ovipositor exserted and as long as the abdomen. 

 The vein from the stigma forms a strong curve with the basal vein of the 

 areolet and an angle is sometimes present at their point of union, 

 iv— 2— 8 



