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XIV. Not(E. DipterologiccB. No. 3. — Descriptions oj new 

 genera and species of the family Acrocerida3. By 

 J. O. Westwood, M.A., F.L.S., &c., Pres. Ent. 

 Soc. 



[Read Gtli September, 1876,] 



The family Acroceridce is remarkable for the singular 

 inflated bodies of many of the species, whence the sectional 

 name of Vesiculosa has been given to the group. The 

 vai'ious structural modifications exhibited by the different 

 genera are of great interest ; thus the antennae are very 

 distinct and porrected in many species, whilst they are so 

 small as to be scarcely visible in others. The proboscis 

 in some is considerably longer than the entire body, whilst 

 in others it appears to be absolutely wanting. The veining 

 of the Avings is also most singvilarly modified ; the veins in 

 some species being almost obsolete and scarcely dis- 

 cernible,* whilst the singular hunchbacked form of some 

 of the groups, especially Philopota and Megali/bus, is quite 

 imique. 



The species wei'e collected into a monograph by the 

 lamented Dr. Erichson, published in his " Entomographien" 

 in 1840, which I supplemented by descriptions of nineteen 

 additional species in the otli volume of our " Transactions," 

 since which time various isolated additions have been 

 made to the group. 



The following is a list of the new genera and species 



described in this paper : — 



Panops Lamarckianus. 

 Lasia a;nea. 



„ leueiventris. 

 „ nigripes. 

 ,, bicolor. 

 Apsona rauscaria. 

 Leucopsina Odyneroides. 

 Megalybus pictus. 

 „ tristis. 



„ gracilis. 



„ subcylindricus. 



Pterodontia dimidiata. 

 Pialea? lutescens. 

 Pialcoidea magna. 

 Notbra bicolor. 

 Astomella apiformis. 



„ bombiformis. 

 Ogeodes Darwinii. 



„ Fortnumi. 



,, Tasmannica. 



„ ignava. 

 Leptyuoma sericea. 



* The comparative study of the veins of the wings in this family is 

 productive of striking results with reference to the system of venation 

 throughout the order Diptera. This subject will probably form one of my 

 series of Notce D'qjterulogicce. 



TRANS. ENT, SOC. 1876. — PAUT IV. (dEC.) L L 2 



