414 



Wirth and Stone: Diptera 



Fig. 14:24. Pelopiinae and Diamesinae. a,b,d,f, Procladius 

 adumbratus Joh. Pupa: a, respiratory organ; b, caudal end, 

 ventral view. Larva: d, labium and paralabials; f, lingua and 

 superlinguae. c,e, Diamesa nivoriunda Fitch, larva: c, labial 

 plate; e, antenna (Johannsen, 1937). 



Subfamily PODONOMINAE 



(Figs. 14:20c?; 14:26a-n) 



This subfamily, which only recently has been sep- 

 arated from the Pelopiinae, is apparently restricted 

 to the colder regions of the world. The immature 

 stages are known to breed in cold mountain streams 

 and lakes and in bog pools. We have reared an unde- 

 termined species of Boreochlus from a sphagnum bog 

 near Washington, D.C., apparently the first North 

 American breeding record. The larvae and pupae of 

 the Podonominae have been described and figured by 

 Thienemann (1937). None of the four Nearctic genera 

 have been reported yet from California. 



swollen thorax, long prolegs, and long tapering head. 

 California species: 



carnea (Fabricius) 1805. 

 flavifrons (Johannsen) 1905. 



months (Linnaeus) 1758. 

 pilosellus (Loew) 1866. 



Lake Tahoe 



Mono, San Diego counties 



Lake Tahoe 



Widespread 



Humboldt County 



Genus Anatopynia Johannsen 

 (Figure 14:23a-/) 



algens (Coquillett) 1902. 

 guttularis (Coquillett) 1902. 



marginellus (Malloch) 1915. 

 venusta (Coquillett) 1902. 



Humboldt County 



Northern and central 



California 



Santa Clara County 



Shasta, Santa Clara 



Genus Pelopia Meigen 

 (= Tanypus Meigen, Protenthes Johannsen) 

 (Fig. 14:23<7-o) 

 punctipennis (Meigen) 1818. Monterey County 



Genus Procladius Skuse 

 (Figs. 14:1c; 14:24a, M,/) 



The larvae of this genus are very common predators 

 of the profundal zone of northern lakes. 

 California species: 



bellus (Loew) 1866. Lassen County, Lake Tahoe 



culiciformis (Linnaeus) 1767. Lake Tahoe 



Genera Clinotanypus Kieffer and Coelotanypus Kieffer 



These genera are very closely related in adult and 

 larval morphology, the adults being robust and hump- 

 backed in appearance, with cordiform fourth tarsal 

 segments and bare wings. Neither genus has been 

 reported from California but they undoubtedly occur 

 there. 



Subfamily DIAMESINAE 



(Figs. 14:20/; 14:24c, e; 14:25; 14:27a; U:29c-g,g) 



This group resembles the Podonominae as well as the 

 Hydrobaeninae in its greater abundance in regions of 

 colder climate. The immature stages are characteristic 

 of mountain brooks or other swift streams, where they 

 live at the splash line or on smooth rocky bottoms in 

 the shallow water of rapids (hygropetric environment). 

 Saunders (1928, 1930) has described and figured the 

 immature stages of Hej>tagyia y and Johannsen (1937) 

 has included descriptions of that genus as well as 

 the other four known Nearctic genera in his memoir. 

 The serious student contemplating work on this group 

 will find the recent revision by Pagast (1947) indis- 

 pensable. No species have yet been reported from 

 California although many await description or dis- 

 covery. 



Fig. 14:25. Diamesinae. a, Diamesa nivoriunda Fitch, caudal 

 end of pupa, dorsal view; b,g, Prodiamesa olivacea (Mg.): b, 

 labial plate and paralabials of larva; g, caudal end of pupa, 

 c-f, Prodiamesa bathyphila (K.): c, respiratory organ of pupa; 

 d, labial plate and paralabials of larva; e, larval mandible; f, 

 larval antenna (Johannsen, 1937). 



