1920] Mann: Ant Guests 61 



The squamiform hairs on the thorax are difficuh to see and 

 in many of the specimens have been rubbed off. 



M. hebardi is close to M. flavocincta Wasmann, which hves 

 with the same species of ant in India, but Rev. Wasmann has 

 kindly compared the two and writes that in hebardi the joints 

 of the cerci are much broader than in flavocincta and the latter 

 species has yellow bands only on the pro-and mesonotum. 



M. hebardi differs from the other species of Myrmecophila in 

 confining itself to one host species. This probably accounts 

 for the small amount of variation in size among the series before 

 me. In a large collection of Myrmecophila the size of the 

 crickets is seen to be in proportion to the size of the ant with 

 which it lives. Small individuals are found in colonies of large 

 ants, but in the collection before me, consisting of a series of 

 nine species, it is very noticeable that the large-sized specimens 

 of each species live with large host ants. 



DiPTERA. (Family Syrphid^). 

 Bardistopus papuanum gen. et sp. n. 



(Fig. 1.) 



(Near Microdon). 



Female: Length 6.5 mm. Form very slender; color black with the 

 sides of front, 2nd and 3rd antennal joints, apex of scutellum, meta- 

 notum, broad lateral stripes on first gastric segment and legs (except 

 tarsi) reddish brown, tarsi yellowish white. Frons at vertex more tharL 

 a third as broad as head, not narrowed toward antennse, subquadrate 

 in shape and barely longer than broad, coarsely and in parts confluently 

 punctate. Ocelli flat, situated on a tubercle which is bordered in front 

 and at sides by a deep groove. Occiput truncate. Face straight in 

 profile, sides with coarse, short, black hairs and yellow pollinose pubes- 

 cence. Antennse very long; arista twice as long as basal joint; basal 

 joint about six times as long as 2nd joint; terminal joint about seven 

 times as long as the basal, very gradually thickened toward apex, 

 which is rounded. Thorax coarsely and irregularly punctate and with 

 abundant, semirecumbent, coarse, black hairs. Scutellum transverse, 

 rounded above, unarmed, anterior posterior borders nearly straight. 

 Metanottmi strongly transverse; with a sub-circular, broad, shallow 

 depression at middle, microscopically striolate and without hairs. 

 Gaster four times as long as broad, rugulose and punctate, moderately 

 densely covered with semirectmibent, silky hairs. First segment mar- 

 gined at sides and elevated in front; second segment transversely 

 impressed in front, the impression deep near sides; third segment as 

 long as the first and second together. Wings hyaline, veins bro\vn. 

 Halteres yellowish white. 



