26 Annals Entomological Society of America [Vol. XII, 



Since the appearance of the Fauna Hawaiiensis (1901) in 

 which Grimshaw describes practically all of the Hawaiian 

 crane-flies, a new species, Dicranomyia foliocuniculator, has 

 been described by Swezey. This latter species is of extreme 

 interest because of the leaf-mining habits of its larv^ — a habitat 

 that is unique in the family so far as at present known. 



The types of the new species, with the exception of Dicrano- 

 myia swezeyi, are in the writer's collection; '"his latter type 

 and paratypes of the other species were returned to Mr. vSwezey. 



FAMILY TIPULID^. 

 Sub-Family Limnobiin^. 

 Genus Libnotes Westwood. 

 Libnotes perkinsi (Grimsh.) 



This handsome crane-fly is common and apparently well 

 distributed throughout the Islands. It was described as a 

 Limnobia but the reference to Libnotes seems more nearly correct. 

 The following additional records from Oahu are at hand : 

 Honolulu, April 10, 1914 (O. H. Swezey). 

 Nunanu Valley, May 4, 1915 (A. H. Case). 



The exotic genera that center around Limnobia and Dicrano- 

 myia include members which run very close to the above groups. 

 In their typical condition these genera (such as Libnotes, 

 Dapanoptera, Peripheroptera, etc.) are well defined, but the 

 presence of less clearly differentiated species tends to break down 

 all distinctions. Speiser (1909) described three African species 

 of Limnobia (Limonia) that are, in my opinion, referrable to 

 two other genera, Libnotes, {rhizosema and oresitropha) and 

 Rhipidia {miosema) . Other authorities, as Bergroth, Edwards, 

 etc., include the species of Dicranomyia that possess a long 

 subcosta in the genus Limnobia, disregarding all other features 

 of organization, and despite the fact that Osten Sacken in his 

 classic monograph of a half century ago clearly differentiated 

 these two groups of Dicranomyia. In determining the generic 

 limits of this division of flies, other features of structure must be 

 considered, and the entire burden not placed on a single char- 

 acter. When this is done, the habitus of the insect and the 

 smaller details of structure that are perceivable but difficult 

 of definition, will aid in separating various groups. It is admit- 

 tedly true that in many such cases the reference of species to 

 genera becomes largely a matter of personal opinion. The 



