382 Mr. E. E. Austen on Specimens of the Oenus 



Walker in the list on p. 387 of vol. ii. of Lord's work ; van 

 der Wnlp is therefore in error in crediting the species to 

 Smith (Biol. Centr.-Amer., Diptera, vol. ii. p. 2). 



Through the kindness of Mr. O. Salvin I have had the 

 privilege of examining the ' Biologia' specimens of Cutiterehra, 

 and after a careful study of the two specimens which van der 

 Wulp (loc. ci't.) somewhat doubtfully assigns to C. approxt- 

 mata, Walk., I am able to say that neither of them belongs 

 to this species. The specimen from Pinos Altos, Mexico, 

 should apparently be referred to C. terrisona, Walk., while 

 that from San Geronimo, Guatemala, seems to me to be a 

 male of C. americana, F. 



Prof. Brauer {' Monographic,' &c. p. 222) states that the 

 eggs of Cut'iterebra are unknown, and he is inclined to think, 

 on account of the structure of the abdomen of the female, 

 that the flies may be viviparous. However, I found an egg- 

 protruding from the ovipositor of the type of C. approximata^ 

 and also discovered an t^g adhering to the type of C. terrisona^ 

 Walk. The egg of C. approximata is about 1^ millim. in 

 length, and is yellowish white in colour ; but with the excep- 

 tion of a longitudinal groove, doubtless due to drying, it 

 appears to present no peculiarities. 



(PI. XIII. figs. 2, 2 a.) 



Cuterebra terrisona, Walker, List Dipt. Ins. in Coll. Britisla Museum, 

 iii. p. 683 (1849). 



The typical specimen (the only one in the collection) is a 

 female from Guatemala {8alU). Dimensions: — Length 

 23^ millim. (correctly stated by Walker as 11 lines) ; width 

 of vertex 3| millim. ; width of head 9 millim. ; width of 

 abdomen at base of third segment lOf millim. ; length of 

 wing 18| millim. 



There are five triangular spots of yellow pollen resting on 

 the inner margin of each eye; the three uppermost spots are 

 small, the other two much larger; the lowest, which rests on 

 ihe inferior angle of the eye, is somewhat more quadrangular 

 than the rest, while the spot above this is much the longest 

 and extends to a point midway between the eye and the tip of 

 the oral cleft ; the extremity of the vertical fissura frontalis 

 on each side is also surrounded with an oval spot of yellow 

 pollen ; the antennary pit is greyish and the occiput yellowish 

 pollinose ; the head is entirely clothed with black hair, and 

 there is no jagged band of yellow pollen on the posterior 

 border of the cheeks below ; thorax, except a narrow oMique 



