162 THiE CANADIAN ENTOMOLOGIST 



Balsam have shown that fairly satisfactory results can be obtained with moth 

 wings which have distinctly dark-colored veins. Since the prints are really 

 negative in character the formation of a clear image of the wing vein is 

 dependent on interference with the free passage of light rays. For this reason 

 the wings of Ctenucha virginica, even though covered with dark scales, give 

 excellent wing prints, due to the very opaque structure of the veins. 



The use of the wing print in the classroom has been tried on a very 

 small scale, but with good results. Students of systematic entomology had before 

 them specimens of the particular insect they were trying to identify and also an 

 enlarged print of the wing. ( )n the print they were able to see distinctly the 

 particular features of wing venation which the instructor wished them to note 

 and then to locate them by the aid of a lens on the wing of the insect. In 

 cases where a particular feature of wing venation has to be determined, in 

 order to successfully use a systematic key, the enlarged print is useful to both 

 instructor and student. When the particular feature has been once located a 

 marked print can be kept at hand for quick comparison with the wings of other 

 insects which the student is tracing through the systematic key, and in this way 

 the time often wasted in searching for negative characters can be saved and 

 doubtful determinations to some extent avoided. 



UNDESCRIBED ERIOPTERINE CRANE-FLIES FROM ARGENTINA 



(TIPULIDAE, DIPTERA) 



BY CHARIJ^S P. ALEXANDER, 

 Uribana, Illinois. 



The following species of crane-flies belong to the extensive tribe 

 Eriopterini. They were included in material collected by Dr. Charles Bruch 

 and Engineer V. Weiser and sent to the writer for determination. The writer 

 would express his gratitude to Dr. Bruch and Senor Weiser for the privilege 

 of examining this interesting series of crane-flies. 



Erioptera (Erioptera) eladoplioroides, sp. n. 



Similar to E. cladophora Alexander (Brazil) ; size much larger; body 



and legs darker colored. 



Male — Length about 4.2 mm. ; wing 4.3 — 4.5 mm. 



Pemale — Length 4.3 — 4.5 mm. ; wing 4.5 — 5.3 mm. 



Rostrum reddish brown ; palpi dark brown. Antennae brown ; flagellar 

 segments in the male with elongate verticils. Head buffy, dark gray pruinose. 



Mesonotal praescutum light gray with a broad brownish fulvous median 

 stripe, the lateral margins of which are bordered with a series of dark brown 

 setigerous punctures ; tuberculate pits large, shiny black, separated by a distance 

 a little greater than the diamers.r of one, situated entirely within the brown, 

 median stripe ; pseudo-sutural f oveae elongate, brownish black ; a conspicuous 

 subquadrate brown spot on the lateral margins of praescutum before suture; 

 scutum light gray, the centres of the lobes light brown ; scutellum light gray 

 with a narrow brown median line ; postnotum gray. Pleural region gray with 

 a broad silvery gray longitudinal stripe, delimited ventrally and more broadly 

 dorsally by narrow brown stripes. Halteres testaceous. Legs with the coxae 



