66 



The Porizon Curculio Parasite {Porizon emotracMi). 



This parasite of the plum curculio is also described in Mr. Riley's Report for 1870, 

 from which the following account is taken ; — 



" The present insect, instead of issuing the same summer as a Hy, remains in its 

 somewhat tougher and more yellowish cocoon all through the fall and winter, and does 

 not issue in the winged state until the following spring. This parasite was first discovered 

 by Dr. Trimble, who sent me the cocoon, from which I subsequently bred the perfect fly. 

 It belongs to the first sub-family (Ichiu'mnonides) of the Ichneumon-flies, and apparently 

 to the genus Porizon, of which it forms a new species. It is only necessary here to state 

 that it difl'ers from the previous species in its reddish-brown abdomen, as well as in form, 

 which may be seen hy referring to the figures (a, female ; b, male ; c, antenna). 



^'"- ^^- Porizon amolracheli, N. Sp. — Head : pitchy black, 



opaque, the ocelli triangularly placed, and close to- 

 gether. Eyes : oval, polished and black. Face : 

 covered with a silvery white pubescence ; labrum 

 rufous, with yellowish hairs ; mandibles and palpi, 

 pale yellowish brown ; antennae inserted in depres- 

 sions between the eyes, reaching to metathorax when 

 turned back, filiform, 24-jointed ; black with basal 

 joints 6-1 becoming more and more rufous, the bul- 

 bus always distinctly rufous ; bulbus rather longer 

 and twice as thick as joint 3 ; joint 2 about one- 

 third as long. Thorax : pitchy-black, opaque, the sides slightly pubescent wth whitish 

 hairs, the mesothorax rounded and bulging anteriorly, the scutellum slightly excavated 

 and sharply defined by a carina each side ; metathorax with the elevated lines well de- 

 fined, and running parallel and close together from scutellum to about one-fourth of their 

 length, then suddenly diverging, and each forking about the middle. Abdomen : glab- 

 rous, polished, very slender at base, gradually broader and much compressed from the 

 sides at the apex, which is truncated ; peduncle uniform in diameter, and as long as joints 

 2 and 3 together ; joints 2-5 sub-equal in length ; colour rufous, with the peduncle wholly, 

 dorsum of joint 2, a lateral shade of joint 3, and more or less of the two apical joints 

 superiorly, especially at their anterior edges, black ; venter more yellowish ; ovipositor 

 about as long as abdomen, porrect when in use, curved upwards when at rest, rufous, with 

 the sheaths longer, and black. Legs, including trochanters and coxae, uniformly pale 

 yellowish-brown, with the tips of tarsi dusky. Wings subhyaline and iridescent, with 

 veins and stigma dark brown, the stigma quite large, and the two discoidal cells sub-equal, 

 and, as usual in this genus, joining end to end, but with the upper veins, wliich separate 

 them from the radial cell, slightly elbowed, instead of being straight, thus giving the 

 radial cell a quadrangidar rather than a triangular appearance. Male differs from female 

 only in his somewhat smaller size and unarmed abdomen. Expanse female 032 inch, 

 length of body, exclusive of ovipositor, 022 ; expanse male 0-28, length 0.18. 



" Described from 3, two females one male, bred May 26th-27th, 1870, from cocoons 

 received from Dr. I. P. Trimble, of New Jersey, and 1 female subsequently received 

 from the same gentleman— all obtained from larvae of Conoiraclielm tienuphar. 



