458 



Wirth and Stone: Diptera 



Fig. 14:51. Empididae, immature stages, a, Hemerodromia 

 rogatoris Coq. (?), pupa; b, Chelifera precatoria (Fallen), larva; 

 c,d, Clinocera stagnalis Holiday: c, pupa; d, larva (o,b, Johann- 

 sen, 1935; c,d, Nielsen ef a/., 1954). 



— Face fusing with lower occiput and extending more or 

 less beneat-h the level of the eyes, its front margin 

 deeply emarginate or impressed and carinate, no 

 inci-sion between face and occiput; cheeks broader; 



acrostichals usually abundant (fig. 14:50a) 



Wiedemannia Zetterstedt 



California Species of Aquatic Empididae 



Subfamily HEMERODROMIINAE 



The following keys and distribution records have 

 been taken from the recent revision of the subfamily 

 by Melander (1947). 



Genus Hemerodromia Meigen 



Johannsen (1935) has described and figured the pupa 

 (fig. 14:51a) of (?) H. rogatoris Coquillett which was 

 found on the rocky bottom of small brooks near Ithaca, 

 New York. Vaillant (1953) described and illustrated 

 in excellent detail all stages of H. seguyi Vaillant 

 (fig. 14:50A;-p) the larvae of which prey upon larvae 

 of Simulium in swift rocky streams of Algeria. 



Key to Adults of the California Species of Hemerodromia 



1. Front femur without distinct basal tubercle beneath, 

 though with basal spine; San Diego and Humboldt 



counties 



empiformis (Say) var. brevifrons Melander 1947 



— Front femur with prominent spine-tipped tubercle at 

 base beneath; California rogatoris Coquillett 1896 



Genus Chelifera Macquart 



Brocher (1909) has described and figured the immature 

 stages of the European C. precatoria (Falle*n) larva, 

 (fig. 14:516) which breeds in mud in small streams. 

 The abdominal spiracles of the pupa are drawn out 

 into long threads which are supposed to be tracheal 

 gills. None of the eleven North American species 

 are yet known from California. 



Genus Metachela Coquillett 



Melander records one of the two North American 

 species, M. collusor Melander 1902, from California. 



The immature stages are not known. 



Key to Adults of the California Species of 

 Neoplasta Coquillett 





1. Dorsal valve of male pygidium large and more or less 

 hemispherical, ventral part of pygidium globular, not 

 compressed or carinate, the dehiscence closed over at 

 base; humeri and most of propleura yellowish 2 



— Dorsal valve of male pygidium inverted triangular, 

 ventral part of pygidium usually compressed and 

 carinate, its dehiscence open at base; humeri black, 

 abdomen of male piceous, of female dull yellowish; 

 California hebes Melander 1947 



2. Dorsal valve of pygidium longer than lateral valve, 

 sometimes very large; tumescence of middle femur of 

 male pronounced, confined to basal 5th, its setae usu- 

 ally close -set; Mariposa, Humboldt, and Santa Cruz 

 counties scapularis var. megorchis Melander 1947 



— Dorsal valve of pygidium scarcely larger than lateral 

 valve; tumescence of middle femur of male extending 

 along basal 4th or 3rd, not pronounced, its setae evenly 

 spaced; California., scapularis scapularis (Loew) 1862 



Subfamily CLINOCERINAE 



Genus Boreodromia Coquillett 

 maculipes (Bigot 1887) California 



Key to Males of the California Species of 



P roc I inopy ga Melander 



1. Under side of middle femur bearing 3 pale setae at 

 base; middle tibia swollen near middle and there bear- 

 ing many flexor setulae; middle basitarsus as long as 

 tibia; 6th abdominal s'egment with many long black 



bristles; Woodside, California 



amplectens Melander 1927 



— Under side of middle femur more extensively setose, 

 the setae evenly distributed and about 12 in number; 

 middle tibia not deformed and as long as basal 2 



