32 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 70 



VOLDIVIA DARWINI, new species 



A species easily recognized by its reddish yellow legs; sides of 

 mesonotum with a distinct gray pollinose border; strongly con- 

 stricted abdomen; metasternum completely girdled with chitin and 

 a rather small dark spot at the base of the subcostal cell. 



Male. — Ej^es fairly approximated, separated by a width equal to 

 length of first antennal joint ; antennae dark brown ; third joint sub- 

 orbicular; arista somewhat longer than length of antennae; face 

 broadly covered with dense, yellowish pollen; tubercle moderate: 

 mesonotum black, bordered on the sides and behind by a dense, 

 grayish pollinose stripe; scutellum black; legs, except coxae and 

 trochanters, reddish yellow ; metasternum bare, girdled with chitin ; 

 hind femur with numerous black spines beneath ; abdomen brownish, 

 the extreme hind borders of second, third, and fourth tergites pale 

 yellow; second segment rather elongated and strongly constricted 

 on its basal two-thirds; hypopygium moderate; wings mostly hya- 

 line, a dark spot at the base of subcostal cell, remainder of cell 

 yellowish; a rather faint preapical cloud on anterior half of wing: 

 squamae yellowish. Length 12.5 mm. ; wing 9 mm. 



Type locality. — Valdivia, Chile (Patagonia). 



One specimen, collected by Charles Darwin. 



Type. — In the British Museum of Natural History. Named for 

 the illustrious naturalist, Charles Darwin, who collected the species 

 while on the famous voyage of the Beagle. 



VALDIVIA NIGRA, new species 



Male. — Differs from darwhvi as follows : The eyes are somewhat 

 more widely separated ; the antennae black, the third joint distinctly 

 larger and broader than long; arista black and distinctly heavier; 

 face deeply concave below antennae, the tubercle more prominent ; 

 mesonotum with a very faint trace of pollen around the borders: 

 legs black save for the yellow apices of femora, bases and apices of 

 tibiae and most of the tarsi ; metasternum membranous behind ; abdo- 

 men black, more elongate and less constricted, the second segment 

 not broadened behind; hypopygium greatly enlarged and protrud- 

 ing; stigma entirely black. Length 15 mm.; wing 10.5 mm. 



Type locality. — Santiago, Chile (1924, A. Faz). 



Type.— Cat. No. 28752, U.S.N.M. 



VALDIVIA RUFICAUDA, new species 



Female. — Very close to V. nigra; in fact, it may prove to be the 

 female of that species, but, because the differences are so striking, it 

 appears to be the better plan to describe it under another name. 



