ART. 11. FLIES OF THE FAMILY CLUSIIDAE MELANDER AND ARGO. 13 



dried specimens usually dark testaceous, the globular hypopygium 

 and small valves luteous. Legs yellowish, of the flexor setae of front 

 and middle femora those of the posterior row are much longer than 

 those of the anterior set. Wings gi-ayish hyaline, basal half of costal 

 margin yellow, apical half blackish, connecting with the blackish tip 

 of the wing, posterior cross vein surrounded by a blackish cloud, sec- 

 tions of fourth vein proportioned 1:1:2, of fifth vein, 3:1. Length 

 5 to 7.5 mm. 



Distribution. — Type from Wasliington, in collection of Natural 

 History Survey, Illinois University; allotype from Cahfornia, in 

 Aldrich collection. Specimens have been reviewed by us from Van- 

 couver Island, B, C; Olympia, Ilwaco, Vashon, Monroe, Dewatto, 

 Mount Rainier, Olga, Everett, and Lake Cushman, Washington; and 

 Viento, Oreg. 



6. Genus CLUSIODES Coquillett. 



Clusiodes Coquillett, Proc. Ent. Soc. Wash., vol. 6, p. 93 (1904). — Hendel 

 Wien. ent. Ztg., vol. 29, p. 309 (1910).— Johnson, Psyche, vol. 20, p. 97 (1913).— 

 Mallock, Proc. Ent. Soc. V/ash., vol. 20, p. 5 (1918); Occ. Papers Bost. Soc. 

 N. Hist., vol.5, p. 47 (1922). 



Heteroneura Fallen (not 1810), Dipt. Suec. Agromyz., p. 2 (1823). — Meigen, 

 Syst. Bes., vol. 6, p. 126 (1830).— Macquart, Hist. Nat. Dipt., vol. 2, p. 587 

 (1835).— Zetterstedt, Dipt. Sc, vol. 7, p. 2786 (1848).— Schiner, Faun. 

 Austr., vol. 2, p. 37 (1864).— Czerny, Wien. ent. Ztg., vol. 22, p. 73 (1903).— 

 Williston, Trans. Ent. Soc. Lond., 1896, p. 386 (1896). 



Agromyza in part, Zetterstedt, Ins. Lapp., p. 790 (1838). 



Clusiaria Malloch, Occ. Papers Boston Soc. N. Hist., vol. 5, p. 49 (1922). 



Columbiella Malloch, Occ. Papers Boston Soc. N. Hist., vol. 5, p. 49 (1922). 



Lunule exposed, two or three reclinate fronto-orbitals, cruciate 

 bristles present, postverticals present in almost all the species, ocellars 

 distinct; prothoracic bristle vestigial, dorsocentral formula 1-2 or 

 0-3, four or six scutellars; preapical present; crossveins approximate. 



Genotype. — Heteroneura alhimana Meigen. 



KEY TO THE SPECIES OF CLUSIODES. 



1. Three strong dorsocentral bristles present, the front pair presutural; at least front 



tarsi more or less black; wings with apical clouding 2 



Two strong dorsocentrals present, if a third pair is present it is small and post- 

 sutural; usually the front tarsi and generally the entire legs yellow; hypopygium 

 relatively robust. (Subgenus Clusiaria Malloch) 10 



2. Postvertical bristles entirely wanting, or if present very small; normally but two 



fronto-orbitals. (Subgenus Columbiella Malloch) 3 



Postvertical bristles present. (Subgenus Clusiodes Coquillett) 5 



3. Thorax mainly rufous, subshining, bivittate with blackish ; lamellae rounded, hairy 



but devoid of bunches of spines; basal two joints of male front tarsi black. 



(Eastern U. S.) (johnsoni Malloch) 4 



Mesonotum and upper pleurae black; lamellae three times as long as greatept 

 breadth, the apical portion less than one-fourth as wide as the basal part, hairs 

 of lamellae long; front metatarsus of male black; palpi yellow. (Atlantic 

 States) apiculata Malloch. 



