434 



Wirth and Stone: Diptera 



Tip of aedeagus not elongated and slender 4 



cockerellii cockerellii (Coquillett) 



Tip of aedeagus broadly rounded (fig. 14:38c) 



Tip of aedeagus distinctly angular 



cockerellii saltonensis Wirth 



Parameres fused in a broad flattened plate 6 



Parameres separated their entire length 10 



Aedeagus with bifid tip; parameres fused at base, with 

 tips separate; ventral root of basistyle much reduced 



variipennis (Coquillett) 



Aedeagus with singfe ■ tip or fused tip; parameres fused 

 at apex, with more or less prominent basal arch; ventral 

 root of basistyle well developed but partly internal, 

 often with rugose membrane connecting with parameres 



7 



10. 



11. 



12. 



13. 



14. 



15. 



16. 



17. 



Ninth sternite with distinct medioposterior lobes; 

 aedeagus with basal arms separate, fused only at 



extreme tips hieroglyphicus Malloch 



Ninth sternite without medioposterior projections; 



aedeagus fused on distal 1/2 8 



Ninth sternite with distinct median posterior cleft; 

 dististyles with greatly expanded bell-shaped apices 



jamesi Fox 



Ninth sternite without median cleft; dististyles with 



very slender, pointed apices 9 



Apicolateral processes of 9th tergite as long as dis- 

 tance between their bases; parameres about twice as 

 long as broad; aedeagus broadly rounded on distal 1/2 



tenuistylus Wirth 



Apicolateral processes of 9th tergite not 1/2 as long 

 as distance between their bases; parameres about as 

 broad as long; aedeagus conical on distal 1/2 



brookmani Wirth 



Parameres' with lateral fringe of spines at apices; 

 ventral root of basistyle in shape of boat hook; anterior 

 arch of aedeagus 2/3 of total length, basal arms narrow 

 and distinctly curved, posterior lateral margin often 



w.ith posterior processes 11 



Parameres "with apices simple or bearing terminal 

 spines; anterior arch of aedeagus less than 1/2 of total 

 length, basal arms stout, not greatly curved, posterior 



lateral margin w.ithout lateral processes 15 



Posterior margin of arch of aedeagus with distinct 



posterior projections 12 



Posterior margin of arch of aedeagus without posterior 



projections 13 



Parameres with lobelike projection on stem before tip, 

 tip broadly expanded and flattened, as wide as length 

 of fringing spines, aedeagus with truncate apex 



haematopotus Malloch 



Parameres with slender stem without lobelike swelling, 

 tip not 1/2 as wide as length of spines, aedeagus with 



rounded apex baueri Hoffman 



Parameres slender and sinuate, without lobelike swel- 

 ling unicolor (Coquillett) 



Parameres with lobelike projection on stem before tip 



14 



Anterior arch of aedeagus broadly rounded, apex trun- 

 cate; parameres with lobe much swollen, pouchlike, 

 apices slender, not flattened, lateral spines short 



mohave Wirth 



Anterior arch of aedeagus acutely notched on median 

 line, apex rounded; parameres with lobe small, flat- 

 tened, apices rather broad and flattened with long 



lateral spines stellifer (Coquillett) 



Parameres with stems subparallel, extreme apices 



flaring in several spinose points usingeri Wirth 



Parameres without spinose apices 16 



Aedeagus conical with sides straight, apex distinctly 



notched with sublateral points monoensis Wirth 



Aedeagus with apex truncate or rounded 17 



Ninth tergite with apicolateral processes subparallel, 

 more than 4 times as long as broad; aedeagus broad 



with flaring apex 18 



— Ninth tergite with apicolateral processes triangular, 

 shorter; aedeagus with apex narrow, tapering, or 

 roundly pointed crepuscularis Malloch 



18. Dististyle abruptly bent and narrowed near base, the 

 latter bulbous; parameres with swollen, crooked bases, 

 distal parts flattened and broad 19 



— Dististyle gently curved and tapering from base; 

 aedeagus with distal part conically tapering, apex 

 only slightly flaring if at all; parameres with bases 

 abruptly bent, not expanded, distal part very slender 



copiosus Root and Hoffman 



19. Aedeagus with distal 3rd subparallel with broader 

 flaring apex utahensis Fox 



— Aedeagus broad with a pair of prominent apicolateral 

 projections at distal 3rd, the part beyond abruptly 

 narrowed to a narrow bell-shaped tip .. .palmerae James 



Tribe HELEINI 



Genus Alluaudomyia Kieffer 



(Fig. 14:38A,i,u) 



Little is known of the habits of this genus. Thomsen 

 (1937) found the larvae of A. bella (Coquillett) in 

 algae, dead leaves, and mud from swamps and ponds 

 in New York, and larvae of A. needhami Thomsen in 

 blanket algae in ponds. The larvae are predaceous. 

 The North American species have been revised by 

 Wirth (1952), and Williams (1953) has reported on the 

 bionomics of two Georgia species. 



Key to Adults of the California Species of Alluaudomyia 



1. Wing with marginal black spots on the membrane midway 

 between the veins; Tulare County 



stictipennis Wirth 1952 



— Wing with marginal black spots on the veins 2 



2. Wing with 8 well-defined, rounded, black spots (fig. 

 14:38^); hind tibia with 3 light rings; Merced County 

 bella (Coquillett) 1902 



— Wing with 10, more or less, black spots, those on 

 posterior part of wing reduced to lines along veins; 

 hind tibia with 2 light rings; Riverside County 



needhami Thomsen 1935 



Key to Adults of the California Species of Helea 



1. Claws of all legs long and similar; anterior radial 

 cells well formed; wing without microtrichia, appearing 

 white 2 



— Claws of fore and midlegs long, of hind legs 1/2 as 

 long; 1st anterior radial cell obsolescent, 2nd very 

 small; wing with microtrichia, appearing grayish 

 hyaline; Tulare and Shasta counties 



longipennis Wirth 1952 



2. M 2 complete or only narrowly interrupted at base (sub- 

 genus Helea) 3 



— M 2 with at least basal 1/2 missing (subgenus Isohelea) 



4 



3. Anterior veins deeply infuscated; wing 2.6 times as 

 long as broad; humeral pits small and narrow; Lassen 

 and Mono counties mallochi (Cole) 1921 



— Anterior veins white; wing broad and rounded, about 

 2.2 times as long as broad; humeral pits large and 





