REPORT OF THE STATE ENTOMOLOGIST I907 2/5 



(probably P . n o t a t a Staeger '39) was sent to me by Professor 

 Cockerell from Boulder, Colorado. This is the only species yet 

 recorded of the genus from this continent. 



NOTE. Bui. 86, page 178, line 5 from the bottom, for plate 36 read 30. 



Genus thalassomyia 



Schiner, 1856 

 Compare Scopelodromus, Bui. 86, page 307. See also an article 

 by Chevrel in Arch, de Zool. Exp. et Gen. Ser. 4. 2. page XXIX 

 in which the author admits the possible identity of the two genera. 



Key of North American species 



a Yellow species, thorax with ochraceous median vitla f u 1 v a n. sp. 



aa Dusky species 



b Dorsum of thorax blackish, with indications of three stripes, covered 



with silvery bloom, most conspicuous on the humeri. N. Y..o b s c u r a 



bb Thorax black, humeral spot yellow ; length 2.5 mm. Arizona. p 1 a t y p u s 



Thalassomyia fulva n. sp. 

 Male. Head yellow, rostrum at tip and the basal joint of the 

 antennae ochraceous; palpi fuscous, slender, basal joint but httle 

 longer than wide, second twice, third thrice, and fourth four times 

 as long as the iirst, the last joint quite slender; antennae and 

 antennal hairs sordidly yellow, 14 jointed, last joint elongate as in 

 Chironomus, eyes bare. Thorax clear yellow, the sternum, meta- 

 nolum, and the three thoracic stripes ochraceous, anterior lateral 

 margins of the scutellum with dark brown spots which are con- 

 tinued in a fine line niesad in the scutellar suture. Abdomen sor- 

 didly yellow, the anterior part of each segaient paler. Genitalia 

 resemble those of T. obscura but apical joint rather longer 

 and blunt at the end. Thoracic and abdominal hairs yellow, thoracic 

 setae sordidly yellow. Legs yellow, tarsi somewhat infuscated, 

 fourth joint less than half as long as the last joint. Fore legs 

 wanting in the single specimen. Claws simple, empodium and pul- 

 villi inconspicuous ; two short black spurs at apex of each tibia. 

 Wings hyaline, whitish tinged, veins including cross vein yellow, 

 cubitus forks distad of the cross vein, costa produced slightly 

 beyond tip of the vein R4+.-,. Halteres yellow. Length 3.5 mm. 

 Old Forge, N. Y. 



NOTE. The name Thalassomyia f u s c a which appears on pages 174, 

 225, 271, 307, 308, 326, of Bui. 86 should read Thalassomyia ob- 

 scura, as boih names refer to the same species. 



