278 



shorter than Sci) i?2+3+4 a trifle longer than the basal section of R b , the distal 

 section of the latter thickened; vein 2nd A and outer end of second section 

 of Cui strongly sinuous. 



Abdomen dull dark brown, including the hypopygium. Male hypopygium 

 with the tergite extensive, the lobes obliquely truncate. Outer dististyle an 

 elongate smooth arm that expands at apex into a long-oval blade. Inner 

 dististyle a much smaller simple blade that narrows gradually to a point. 

 Gonapophyses appearing as strongly curved sickle-shaped hooks that narrow 

 gradually to acute points, their margins smooth. Ovipositor with the valves 

 yellowish horn-color, the tergal valves long and slender, gently upcurved, 

 the margins smooth. 



Habitat. — Connecticut. 



Holotype. — Male, Manitic Lake, in cranberry bog, June 8, 1929. (C. P. 

 Alexander). 



Allotopotypes. — Female, pinned with type. 



Paratopotypes. — Fifteen males and females, June 8-9, 1929 (Alexander and 

 Crampton) . 



Type. — Preserved in the collection of the author. 



Paratypes. — In the Boston Society of Natural History and Connecticut 

 Agricultural Experiment Station Collections. Alcoholic material in the 

 collection of Dr. Crampton. 



Erioptera idiginosa is undoubtedly a characteristic bog-in- 

 habiting species, associated in nature with other equally char- 

 acteristic bog forms as Phalacrocera tipulina 0. S., Limonia 

 (Dicranomyia) uliginosa Alexander, L. (D.) sphagnicola Alexan- 

 der, Pseudolimnophila inornata (0. S.), Limnophila (Phylidorea) 

 platyphallus Alexander, Pilaria stanwoodae (Alexander), P. ver- 

 montana Alexander and Erioptera ebenina Alexander. It was 

 formerly considered that the sphagnum bogs in northeastern 

 North America supported a very restricted crane-fly fauna but 

 this is certainly not the case. Many of the bog species are local 

 and most species become more active at dusk, remaining con- 

 cealed during the hours of bright sunlight. 



Erioptera uliginosa has the knobs of the halteres darkened, 

 in this respect agreeing most closely with E. septemtrionis Osten 

 Sacken and E. ebenina Alexander. It differs from the former in 

 the strongly darkened wings and structure of the male hypopygi- 

 um, as the simple inner dististyle; from ebenina it differs in the 

 opaque mesonotum and very different hypopygial structure. In 

 its general appearance, especially the coloration of the body and 

 wings, the new species more closely resembles E. villosa Osten 

 Sacken, differing conspicuously in the darkened knobs of the 

 halteres and the structure of the male hypopygium. 



