430 Mr. Claude Morley on the 



PHTHORIMU8, Tlioms. 



(2). 1. Areola transverse ; temples nar- 

 row ; abdomen not strongly 

 punctate 1. compressus, Desv. 



(1). 2. Areola elongate ; temples broad ; 



abdomen strongly punctate . 2. anomalus, Mori. 



Synonymy, Economy and Distribution. 



During the course of the last ten years I have been 

 enabled to amass a little over seven hundred specimens of 

 this group in Britain, and perhaps it may not be out of 

 place to here indicate their relative frequency in our islands. 

 The species bearing an asterisk have not yet been noted as 

 indigenous ; of the rest there are only three species not 

 represented in my collection, from the closely examined 

 specimens of which alone this summary is drawn up, the 

 respective number of specimens there representing each 

 species is indicated in parentheses. A dagger indicates that 

 the species is new to Britain. 



T. fiavipes, Holmgr. (1.) Very rare ; my only specimen was 

 taken by Dr. Capron, probably about Shere in Sur- 

 rey ; Bridgman records it from Worcester in May, and 

 doubtfully from Norfolk. It has been bred from a 

 Syrphais pupa. [ = T. polita, Voll. ; = B. tibialis, 

 Bridg. ; = T. pallipes (sic), Thorns.] 



Z. rufiventris, Grav. (7.) Not rare at Brandon in Suffolk 

 in June 1903 ; Lowestoft on umbelliferous flowers, 

 August ; Wicken in Cambs., June ; Reigate in July. 

 [ = sulcator, var. 2, Grav., $ .] 



Z. holmgrcni, Bridg. (16.) Somewhat common in the 

 Breck district of Suffolk, June to August ; Surrey 

 (Capron) ; Greenings (W. Saunders) ; Hartiug in May 

 (Beaumont) ; Point of Aire (Tomlin). [I have fol- 

 lowed Thomson in considering the species of Zootre- 

 plms as distinct ; it is quite possible that Bridgman 

 did not know Z. rufiventris, which stocd under an 

 incorrect genus in the British list. The relative 

 rugosity of the metathorax and rufescence of the 

 abdomen are the only features of separation which to 

 me appear to be at all constant. Thomson separates 

 them thus : — 



