415 

 Wirth and Stone: Diptera 



/s r. 



Fig. 14:26. Podonominae and Tendipedinae. a-e,i, Lasiodiamesa, Pupa: a, caudal segments; 

 b, respiratory organ. Larva: c, caudal segments; d, labrum and mandible; e, labial plate; i, 

 antenna. f-h,j, Podonomus, larva: f, labial plate, left half; g, caudal segments; h, antenna; /', 

 pupa, k-n; Trichotanypus, Pupa: k, caudal segments; m, respiratory organ. Larva: /, antenna; 

 n, labial plate.- o, Calopsectra (Rheotanytarsus) rivulorum (K.), larva and case showing salivary 

 net (a-n, Thienemann, 1937; o, Walshe, 1951). 



Subfamily CLUNIONINAE 



California, with its long, rugged coastline, has been 

 exceptionally well provided with its share of the 

 world's "marine midges." These remarkable insects 

 probably form a highly evolved and specialized off- 

 shoot of the Hydrobaeninae, from which in many cases 

 the immature stages cannot well be distinguished. 

 This subfamily is restricted, with the exception of 

 some secondarily adapted mountain-stream Hawaiian 

 species, to the zone of algae-covered rocks between 

 tide levels on seacoasts. The larvae form silken 

 cases on the rocks and between the bases of the algae 

 filaments on which they feed. They pupate in rein- 

 forced larval cases, and several genera have evolved 

 a remarkable, highly sclerotized, obliquely flattened, 

 caudal disc on the pupa, probably to offset the high- 



water pressures set up in the tunnels by wave action. 

 This subfamily has been revised by Wirth (1949), 

 including intensive field collections and study in Cali- 

 fornia where the following species have been found. 



Genus Eretmoptera Kellogg 

 browni Kellogg 1900. Point Lobos, Monterey County 



Genus Tethymyia Wirth 



(Fig. 14:30a-/>) 



aptena Wirth 1949. Mendocino to Monterey County 



