PROC. ENT. SOC. WASH., VOL. 22, NO. 3, MAR., 1920 



59 



Tachytes duplicatus, new species. 

 Very close to T. calcaratus Fox and agrees with the type except 



as follows : 



T. calcaratus Fox. 



1. Bristles of pygidium of a golden 



color and extending to lateral 

 margin. 



2. Pygidium more elongate and nar- 



rower apically. 



3. Second abcissa of radius shorter 



than third. 



4. Mesepisternum sparsely pilose, 



the pile grayish. 



5. Abdominal bristles brownish. 



T. duplicatus, new species. 



1. Bristles of pygidium reddish 



brown and not reaching lateral 

 margin. 



2. Pygidium shorter and the apex 



broader. 



3. Second and third abcissae of 



radius subequal. 



4. Mesepisternum densely pilose es- 



pecially on dorsal part of pre- 

 pectus, the pile with a distinct 

 golden tinge. 



5. Abdominal bristles black. 



Type locality. -Inverness, Florida. Described from one female 

 collected by Charles Robertson and under his number 24981. 

 TypeCat. No. 22614, U. S. N. M. 



Tachytes pepticus var. floridanus, new variety. 



Male. Length 10 mm. Differs from the typical form in having the scutum 

 and scutellum shining and punctured (not opaque, finely granular and punc- 

 tured); in the shining almost sculptureless sides of propodeum; in the rather 

 narrower apical sternite; and in having the median projection of the clypeus 

 more distinctly depressed. 



Type locality. -Inverness, Florida. Described from one male 

 collected by Charles Robertson and under his number 24824. 

 Type. Cat. No. 22730, U. S. N. M. 



A PROCTOTRYPID INQUILINE WITH FORMICA EXSECTOIDES 



FOREL. (HYM.). 



BY WM. M. MANN, U. S. Bureau of Entomology. 



On the Conduit Road, about three miles east of Great Falls, 

 Maryland, is a very fine cluster of Formica exsectoides mounds. 

 In October, 1919, Mr. J. C. Crawford and the writer made two 

 collecting excursions to these and found a number of myrmeco- 

 philous insects. On the surfaces of the nests two case-bearers, 

 Coscinoptera sp., and a Pyralid moth were numerous, Myrme- 



