Subfamily DIAPHORINAE 



Genus Aryyra Meigen 



(Fig. UAQl,m) 



Marchand (1918) described and figured the immature 

 stages of Aryyra albicans Loew which he found in 

 mud on the edge of a pond. The following adult key is 

 an adaptation of one to the North American species 

 by Van Duzee (1925). 



Key to Males of the California Species of Argyra 



1. Abdomen without yellow on the sides, or very nearly 

 so 2 



— Abdomen with distinct yellow ground color on some of 

 the segments 8 



2. Anterior coxa wholly black, or nearly so 3 



— Anterior coxa yellow, at least on apical 1/2 7 



3. Hind basitarsus with long bristles 4 



— Hind basitarsus with only the usual short hairs 5 



4. All femora black with their tips narrowly yellow; Del 

 Norte and Humboldt counties 



nigriventris Van Duzee 1925 



— All femora yellow, except apical 1/2 of posterior pair; 

 Mono County argentiventris Van Duzee 1925 (part) 



5. Middle femur widened below near basal 3rd, so as to 

 form an obtuse angle; its tibia with a brush of hairs 

 near the middle; Los Angeles and San Diego counties 



femoralis Van Duzee 1925 



— Middle femur nearly evenly rounded or straight below 



6 



6. Face and front velvety black; California 



nigripes Loew 1864 



— Face white or grayish white; front metallic green with 

 more or less gray pollen; Humboldt to San Mateo 

 counties barbipes Van Duzee 1925 



7. Hind basitarsus with long bristles 



argentiventris Van Duzee 1925 (part) 



— Hind basitarsus with only the usual short hair; Cali- 

 fornia cylindrica Loew 1864 



8. One pair of femora more than 1/2 black or green .... 9 



— All femora yellow, tips of posterior pair may be broadly 

 black 10 



9. All femora black or green, their tips may be yellow; 

 Del Norte County albiventris Loew 1864 



— One or 2 pairs of femora largely yellow; Alameda 

 County splendida Van Duzee 1925 



10. Fore coxa almost wholly black; Alameda and Los 

 Angeles counties calif omica Van Duzee 1925 



— Fore coxa yellow, sometimes considerably blackened 

 at base argentiventris Van Duzee 1925 (part) 



Subfamily CAMPSICNEMINAE 



Genus Campsicnemus Haliday 



(Fig. 14:49a-c) 



The males of many species of Campsicnemus have 

 remarkable secondary sexual modifications, usually 

 on the middle tibiae, from which the genus takes its 

 name. The adults habitually run or skate on the 

 surface of still water, or they frequent damp vegeta- 

 tion. Williams (1939) goes into remarkable detail on 



455 

 Wirfh and Stone: Diptera 



the habits of the numerous Hawaiian species, each of 

 which seems to prefer a special little niche in the 

 stream- or pond-side environment. He was able to 

 rear one aquatic species through its life cycle on 

 mud in the laboratory, and made a more complete 

 larval study of another species which breeds in 

 decaying banana stems. Nielsen, et al. (1954) do- 

 scribed and figured the larva of C. armatus Zett. 

 which lives in wet soil of bogs and meadows in 

 Iceland. The following key is taken from Harmston 

 and Knowlton's (1942) key to the North American 

 species. 



Key to Males of the California Species of Campsicnemus 



1. All femora black, though tips may be narrowly yellow; 

 northern and central California 



nigripes Van Duzee 1917 



— At least 1 pair of femora 1/2 yellow 2 



2. Middle tibia greatly thickened and deformed, at least 

 near middle 3 



— Middle tibia not thickened; Del Norte to San Mateo 

 counties degener Whes ler 1899 



3. Middle tibia deeply excavated near apex, bearing in 

 hollow of the excavation a conspicuous peduncled 

 process; Modoc County philoctetes Wheeler 1899 



— Middle tibia without such a peduncled process near the 

 apex; Lake Tahoe claudicans Loew 1864 



REFERENCES 



GREENE, C. T. 



1923. The immature stages of Hydrophorus agalma Wheeler 

 (Diptera). Proc. Ent. Soc. Wash., 25:66-69. 

 HARMSTON, F. C, and G. F. KNOWLTON 



1940. T achytrechus studies (Dolichopodidae, Diptera). 



Canad. Ent.', 72:111-115. 

 1942. The Dipterous genus Campsicnemus in North 

 America. Bull. Brooklyn Ent. Soc, 37:10-17. 

 JOHANNSEN, O. A. 



1935. See Diptera references. 

 LUNDBECK, W. 



1912. Diptera Danica. Part IV Dolichopodidae. Copen- 

 hagen. 407 pp. 

 MARCHAND, W. 



1918. The larval stages of Argyra albicans Lw. (Diptera, 

 Dolichopodidae). Ent. News, 29:216-220. 

 NIELSEN, P., O. RINGDAHL, and S. L. TUXEN 



1954. The Zoology of Iceland. Vol. Ill, part 48a. Diptera, 

 1:1-189. 

 PETERSON, A. 



1951. See Diptera references. 

 SAUNDERS, L. G. 



1928. See Diptera references. 

 SMITH, M. E. 



1952. Immature stages of the marine fly, Hypocharassus 

 pruinosus Wh., with a review of the biology of immature 

 Dolichopodidae. Amer. Midi. Nat., 48:421-432. 



VAN DUZEE, M. C. 



1925. A revision of the North American species of the 

 genus Argyra Macquart, two-winged flies of the family 

 Dolichopodidae. Proc. U.S. Nat. Mus., 66:1-43, 1 pi. 



1926. A table of the North American species of Hydro- 

 phorus with the description of a new form (Diptera). 

 Pan-Pac. Ent., 3:4-11. 



VAN DUZEE, M. C, and C. H. CURRAN 



1934. Key to the males of Nearctic Dolichopus Latreille 

 (Diptera). Amer. Mus. Novit. no. 683, 26 pp. 



