A Revision of the Asilidae of Australasia. *i09 



when viewed veitically are more sinootlily coiitinuou.s. Tliis 

 result seems to be attained by ii crusliiuf^ togetlier of the 

 elements of the teeth, and consequent obliteration of the 

 normal structure. 



In old specimens with worn teeth these characters are not 

 readily perceptible, but another and still more striking one 

 becomes then availai)le, namely the number of the molar 

 roots, M'hich in a hypsodont animal only become visible in old 



The molars of old specimens of both Akodon and ZijQO- 

 dontomys show on their inner aspect the following roots : — 

 «<\ one root under the anterior lamina and one broad one 

 supporting both the second and third laniinie ; m^, one broad 

 root under the two laminre ; m^, one root. In Scotinomys, on 

 the other hand, every lamina of each tooth has its separate 

 supporting root, so that on the inner side there are three in 

 «t^, two in m^, and two (less distinctly separated) in m^. 

 This number of roots I fail to find in any of the allied geneia. 



Type. Scotinomys teguina [Ilesperomys teguina, Alst.). 

 Other described forms : S. teguina apricus ^, Bangs, S. xeram- 

 pelinus. Bangs, and S. irazUj Allen, 



XLVII. — A Revision of the Asilidie of Australasia. 

 By Gertrude Ricardo. 



[Continued from p. Ifi6.] 



Blepharotes, Westwood in Duncau. 



The Natural Libr. xxviii. p. 329 (1840). 



Blepharis, Macq., Dipt. Exot. i, (2) pi. viii. fig. 1 (1838) [proeocc. Cuv, 



rise. 1817; yerv. Ortli. 1831]. 

 C'rasiKdia, Macq., Dipt. Exot.'i. (2) p. 198 (1838) [proeocc. Hiibn. 



Lepid. 18] OJ. 

 PsecaSy Jaenu., Abhandl. Senckenb. naturf. Ges. vi. p. 359 (18G7), 



The following species have been described and one new 

 species is added ; — 



Blepharotes coriarius, Wied,,Auss. zweifl. Ins. ii. p. 644 [^Asilus] (1830) ; 

 Macq., Dipt. Exot. i. (2) p. 198 [Craspedia] pi. viii. fig-. 1 '[Blepha-^ 

 rotes^ (1838) ; Ericbson, Arcliiv f, Naturgesch. vii. 2 (1841) ; iScLiner, 



* Possibly an Oryzojnys of the Melanomys section, in spite of its .strong 

 jeseiublance to S. teguina. 



Ann. (X* May. X. Hist. Ser. b- Vol. xi, 28 



