OF WASHINGTON, VOLUME XIII, 1911. 213 



segments blackish; hind femora dark at tips, hind tibia with a dark 

 line above; the thorax, from above, shows two parallel pale stripes. 

 Antennal arista long, pubescent; bristles on front as figured (fig. 1) ; 

 stiff bristles below eyes; four bristles each side on thorax from base 

 of wing toward head, and one lower down about midway from wing 

 to head; a bristle each side near base of scutellum, four sub-equal 

 bristles on scutellar margin; bristles on costal edge of wing about 

 three-fifths the width of the costal cell; hind tibia with a row of short 

 bristles above, and lower inner edge of the hind metatarsus with a row 

 of about 15 short, stiff bristles in an even row. Segments of abdomen 

 with two rows of bristles above, and marginal hairs. Length 2 mm. 



From Falls Church, Virginia, July 8, pestering a myriopod 

 (Panijidns sp.) 



Differs from A. nigriceps in pale head, and no marks on 

 pleura; from A. picta in absence of dots below base of wings, 

 and in the hyaline wings. 



-Mr. Barber said that on June 25 he saw a large Spirobohis 

 writhing in the little-used wood-road on the Virginia shore 

 opposite Plummers Island, Maryland, with a swarm of ten or 

 a dozen phorid flies alighting upon it whenever opportunity 

 offered. Thinking they were ovipositing, the centipede was 

 saved for breeding, but no flies could be caught and none is- 

 sued from the myriopod, which died after about three weeks 

 in a breeding-jar. In July this year Dr. A. K. Fisher saw a 

 small julid at Sandy Springs, Maryland, acting strangely, and 

 observed a small fly riding upon its back, except during the 

 worst of its contortions. Both specimens were taken and ap- 

 pear to be the same as those described by Mr. Banks. In 

 September another specimen of the same fly was observed di- 

 viding its attentions between a large and apparently healthy 

 Spirobolus and a smaller one that had been partly crushed 

 on a path, near where he had seen the specimens in June- 

 Both myriopods were much annoyed by the fly, but the in- 

 jured one being less able to defend itself, was collected after 

 half an hour's observation, for breeding. Nothing, however, 

 issued. 



Mr. Schvvarz spoke of the observations by the late Mr. 

 Hubbard on a small black fly, perhaps not a phorid, attacking 

 spiders. Mr. Barber spoke of Mrs. Slosson's account of 

 ( cratopogon attacking caterpillars. 



