98 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



hemerocampae, which was placed in synonymy with Carcelia am- 

 plexa. In 1912 Townsend proposed his genus Oxexorista, 16 which 

 must now be placed in synonymy with Sisyropa. Townsend places 

 both Sisyropa and OxexoHsta in the tribe Carceliini. 



The main diagnostic characters of the genus Sisyropa are as follows : 

 Scutellum with four pairs of marginal scutellars and one strong apical 

 pair; hind tibia strongly ciliate on the anterodorsal side, in both 

 sexes, with regular, long, comblike, curved bristles, among which one 

 sometimes stands out larger; third abdominal segment of male with 

 a dense patch of hairs underneath on each side. These characters 

 will readily separate Sisyropa from Aplomya. As the front at the 

 vertex or narrowest part is 30 per cent or less of the head width and 

 the predominant sexual characteristics (front narrower, and claws 

 and pulvilli elongated in the male) are retained, Sisyropa can be 

 readily separated from Phryxe, Thelymyia, and Chrysophryxe. As 

 the gena is one-sixth to one-seventh the eye height, Carcelia is readily 

 excluded. The shape of the abdomen, which is Carcelia-\ike, should 

 not be confused with that of Zenillia. The Nearctic species of Sisy- 

 ropa lack bristly hairs behind on the apex of the hind coxa. 



Using the main characters as cited, only the following two species 

 of those indicated as belonging in Brauer and Bergenstamm's genus 

 in 1891 can be retained: Sisyropa thermophila (Wiedemann), geno- 

 type, Oriental Realm; Sisyropa lota (Meigen), Palearctic Realm. 

 S. lota was referred to Exorista of authors by Baer, Stein and 

 Lundbeck. 



If the pilosity of the eyes is disregarded, the biological relationship 

 of Sisyropa to the genus Sturmia is evident. Townsend refers Sisy- 

 ropa to the tribe Carceliini and Sturmia to Sturmiini, which he con- 

 siders to be close to Carceliini. 



Townsend considers Exorista lobeliae Coquillett to be a Sisyropa. 

 Neither E. lobeliae nor Zenillia valens Aldrich and Webber, which 

 is similar to lobeliae in many respects, possesses the characteristics 

 ascribed to Sisyropa. These two species are not treated in this re- 

 vision ; instead, they are referred to the Phorocera complex of Aldrich 

 and Webber. 



; 16 In 1915, convinced that the specimens T D 395 and T D 425 (upon which Oxeforista 

 was founded) were distinct from eudryae, Townsend proposed the name thompsoni for 

 them. He states that the Dayton, Ohio, female in the U. S. National Museum reared by 

 Jewett (determined by Coquillett as eudryae) was designated for him by Coquillett as 

 the holotype of thompsoni. As an examination of this specimen proves it to be eudryae 

 Townsend, the synonymy is established. It is difficult to see how the designation by 

 Townsend in his Manual, "The true holotype of the genotype is labelled T D 395 and the 

 paratype T D 425" can be accepted. It is unfortunate that the specimen T D 395 was 

 not originally designated as the holotype. The specimen T D 395 was found in the United 

 States National Museum as a paratype of Zenillia formosa Aldrich and Webber and is 

 now referred to Carcelia. 



