48 Psyche [February 



Orimarga argenteopleura sp. now 



Dark brownish black; pleura? with a silvery-blue band; legs uniform dark brown. 



d", Length, 8.8 mm.; wing, 6.4 mm.; abdomen, 6.8 mm. 



Fore leg, femur, 5 mm.; tibia, 5.3 mm.; tarsus, 5.1 mm. 



Hind leg, " 5.4 mm.; " 5.5 mm.; " 4.2 mm. 



9 Length, 6.2 mm.; wing, 4.9 mm. 



c? Head: rostrum and palpi dark brownish-black; antennae, basal segments 

 dark, silvery-greyish pollinose; flagellar segments dark brownish-black. Front 

 very pale blue, the vertex and occiput brown with a sparse bluish bloom; back of 

 the eye, on the vertex, seven or eight very long dark hairs. 



Thorax: mesonotum very dark brown without apparent dorsal stripes; a narrow 

 bright silvery-blue stripe running along the extreme lateral edge of the thorax, 

 beginning on the end of the prothoracic scutellum, continuing to above the wing- 

 basis. Pleurae dark brownish-black with a much broader silvery band extending 

 from above the fore coxa back to above the hind coxa. Halteres, stem light brown, 

 knob dark brown. Legs: coxae, trochanters and extreme base of the femora light 

 brown, the remainder of the legs dark brown. Wings: uniformly suffused with 

 dark; veins almost black; extreme apice of the wings, in the ends of the radical cells, 

 still darker brown. Venation: (See fig. f.): Rs angulated at its origin; cross- 

 vein r at the tip of Ri; cross-vein r-m distad of the level of r; basal deflection of Cui 

 at about one-third the length of Rs. 



Abdomen very elongated, dark brownish-black. 



9 Almost exactly like the o\ but much smaller. 



Holotype, d" Trece Aguas, Cacao, Alta V Paz, Guatemala, April 24. 

 (Barber and Schwarz, coll.) Allotype, 9 • Type-locality, April 26, (Barber and 

 Schwarz) . 



Types in the U. S. National Museum coll. (Cat. No. ) 



Ceratocheilus Wesch6 



1910. Ceratocheilus Wesche; Journ. Linn. Soc. Zool.; vol. 30; 

 p. 358. 



1912. Neostyringomyia Alexander; Canad. Ent.; vol. 44; p. 

 85. 



The genus Ceratocheilus was erected by the late Mr. Wesche for 

 a species which he described as new (ivinnsampso?ri) , but which 

 Mr. F. W. Edwards has since determined as being conspecific with 

 the Styringomyia cornigera of Speiser. Neither Mr. Wesche's 

 paper, nor Mr. Edward's extremely valuable article (Annals and 

 Magazine Nat. Hist.; series 8, vol. 8, p. 279-283; Aug. 1911) 

 were available to me until after my paper was issued, wherein I 

 erected the subgenus Neostyringomyia, using exactly the same type, 

 cornigera Speis; consequently my name falls as a rank synonym of 



