166 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



elongate white maggots on or near host, while the first (TD388, Gip. Moth 

 Lab. 1975) deposits black microtype eggs on foliage. Thus Sisyropa may 

 have either one of these habits, or perhaps still a different one. Sisyropa 

 hemerocampceTowns. (syn.of Exorista amplexa Coq.,acc. W. R. Thomp- 

 son) probably does not belong to the present genus. Its egg shows no 

 8 ign of pedicel, while the dissected eggs of Exorisfaeudryce(TT)'&Q5)$\wyfedL 

 an atrophied pedicel. It is most probable that Sisyropa hemerocampce 

 Towns, is congeneric with T. thermophila Wd., since both have the front 

 very narrow, the cheeks and especially parafacials extremely narrow, and 

 the eyes thickly hairy. 



Reproductive habit, larviposition of white maggots on or near host. 

 The maggot is fat, with 13 wide and complete rows of microscopic spines 

 encircling the body, the spines somewhat weaker dorsally. The sperma- 

 thecal ducts are elongate and doubled on themselves. Uterine capacity 

 up to 200 or 300 eggs and maggots. (TD395, collected by D. H. demons, 

 Aug. 22, 1908, Melrose Highlands, Massachusetts, and TD425, collected 

 by F. B. Lowe, August 29, 1908, near Swampscott, Massachusetts; both 

 determined by W. R. Thompson as Exorista eudryce Towns. 



Type: Exorista eudryce Towns., Trans. Am. Ent. Soc., 

 vol. xix, pp. 287-288. 



Euexorista, gen. nov. 



Erected for Exorista futilis O. S. This has the general external char- 

 acters of Parexorista, and was referred to that genus by B. and B.. 

 along with the host of other species of various reproductive habits. Thus 

 B. and ^sParexorista is another mixed-reproduction genus. The present 

 form has no discal bristles on intermediate abdominal segments, and the 

 hind tibiae are ciliate. 



Reproductive habit, leaf-oviposition of black microtype eggs. Uterine 

 capacity up to 2,000 or 3,000. Chorion with a low power shows a beaded 

 net-like design, the bead strings running from pole to pole and more or 

 less interlaced into a network; with high power (oil immersion) it shows a 

 structure composed of a microscopic network of chitin, the lines of chitin 

 being much narrower than the open spaces between them. (TD361, 

 August 15, 1908, Spot Pond, near Melrose, Massachusetts, and TD344 

 August 13, 1908, North Andover, Massachusetts; both collected by D. H. 

 demons, and determined by W. R. Thompson as Exorista futilis O. S.) 



Type: Tachina (Exorista) futilis Osten-Sacken, Can. Ent., 

 vol. xix, p. 161. 



It appears from the descriptions that this species can not 

 belong to Epimasicera, type Tachina ivestennanni Zett. 

 (syn. of Tachina mitis Meig., ace. Thomson, Bezzi and Stein), 

 since this genus has two pairs of median discal macrochaetae 

 each on second and third abdominal segments and the hind 

 tibiae are not ciliate. 



