MEDITERRANEAN FRUIT FLY IN ITAWATI. 



89 



DESCRIPTION. 



Adult. — Silvestri's description of the adult is as follows: 



9 . Head, thorax, first segment of the antennae, front and middle legs testaceous- 

 ferruginous in color; abdomen in great part brown or shining blackish brown; wings 

 slightly infuscate, with the stigma and veins brown; third pair of legs entirely brown 

 from apex to trochanters. Head a little broader than the thorax, about one-fourth 

 wider than long with a slight median longitudinal ridge on the face, epistoma slightly 

 semicircularly produced in the middle; antennae longer than the body, with 45 seg- 

 ments; eyes small, twice as long as wide. Mesothoracic 

 scutum with the parapsidal furrows smooth and deep, con- 

 vergent, uniting in a deep median pit situated a little before 

 the posterior margin; transverse prescutellar sulcus with 

 a large pit divided into four small ones and each provided 

 also with an incomplete posterior division; scutellum smooth; 

 parascutellar pit with an internal scarcely visible crenulation; 

 metanotum with a short very slight median carina flanked by 

 two small depressions, lateral pit with an abbreviated carina; 

 propodeum with a small anterior conical protuberance directed 

 forward, median and submedian surface almost smooth, a lit- 

 tle rugose at the sides and posteriorly, mesoplural sulcus 

 crenulate. Wings with the venation shown in figure [PL 

 XXI, fig. 2.] Abdomen with all the segments smooth and 

 shining, with few hairs; ovipositor about as long as the body. 

 Length of body, 3.5-4.5 mm.; width of thorax, 0.95 mm.; 

 length of antennae, 5 mm.; length of front wing, 4 mm.; 

 width of same, 1.7 mm.; length of third pair of legs, 4.4 mm.; 

 length of ovipositor, 4.5 mm. 



<? . Similar to the female. 



Larva. — Oval in form, whitish, with the skin smooth and ap- 

 parently naked, but under strong magnification may be 

 seen to be provided with dense, small, and slender points. Mandibles short, slightly 

 arcuate, and gradually attenuate, terminating in a point. Antennae very short. 

 Length of body, 3 mm.; width, 1.6 mm. 



Egg. — The egg of Diachasma tryoni is glistening white, about 0.57 

 mm. long and distinctly attenuated at each end. 



Larva. — The newly hatched larva, which is about 1 mm. long, is 

 similar to that of Opius humilis (fig. 20, a, h) and Diachasma fullawayi 

 in general shape and in the possession of two ventral appendages 

 upon the first body segment. The proportionately large jaws are 

 similar to those of newly hatched larvae of humilis and fullawayi 

 but slight distinguishing characters can be found in the large chitinous 

 ventral plate of the head. 4 



Pupa. — The young pupa is white in color, about 4 mm. long, 

 1.7 mm. wide, and may be distinguished from that of either humilis 

 or fullawayi by the length of the ovipositor. (Fig. 22.) 



Diachasma fullawayi Silv. 



Fig. 22.— Diachasma try- 

 oni: Lateral view of 

 pupa. Greatly enlarged. 

 (Original.) 



Diachasma fullawayi (Plate XXI, fig. 1) was first reared and de- 

 scribed by Silvestri from pupae formed by larvae of Ceratitis gijfardi 



