E. T. CRESSON, JR. 105 



studying the genus. From the other species they differ most 

 noticeably in the uniformity of the color over the entire insect, the 

 usual grays of the face, pleura and abdomen being entirely absent. 

 The abdomen is, however, generally banded with olivaceous but 

 is never whitish. Structually the head is more flattened in 

 profile; the face less prominent; eyes vertical, thus reducing the 

 otherwise broad cheeks. In many respects the species here 

 suggest a tendency towards Dichaeta. 



Description. — Eyes vertical; face flattened, slightly convex; parafacalia 

 linear; cheeks moderately broad; third antennal joint broad apically. Pleura 

 and venter never cinereous. 



Type species. — Paralimna decipiens Loew. 



Table of Species 



Opaque species decipiens p. 108. 



Shining species obscura p. 109. 



Subgenus Paralimna 



The species comprising this subgenus are cjuite homogeneous 

 in their color pattern and form a group that is not to be confused 

 with the preceding. The group may be characterized as follows: 



Description. — -Eyes rounded; face large, broad, swollen, prominent, with 

 more or less distinctly convex hump near middle, lower portion broad and 

 vertical in profile; parafacials moderately broad; cheeks very broad. Third 

 antennal joint tapering apically. Pleura and venter more or less cinereous. 



Type species. — Paralimna appendiculata Loew (Subject to the 

 condition mentioned in the discussion of the type of the genus 

 Paralimna) . 



Description of Color Pattern. — The color pattern of the species of this group 

 is so constant that the repetition of the same in each description of the species 

 is superfluous. A general review of such characters is given here and will not 

 be referred to again unless there are important differences. 



Frons dark brown, more or less variegated with lighter labyrinthal markings 

 which may vary in intensity of pattern or color or may be almost wanting; 

 orbits more or less narrowly silvery with one or more interruptions; opposite 

 the antennae or slightly below on the parafacials are usually present two 

 opaque black spots separated by a silvery spot, best seen from the side. Cly- 

 peus concolorous with the face. Mesonotum light pruinosc with numerous 

 minute darker brown irrorations which sometimes coalesce into larger blotches; 

 between the dorsocentral series may be two to three well defined dark stripes. 

 Scutellum concolorous and irrorated, with apex more shining and black. 

 Pleura and metanotum densely cinereous, becoming darker below, contrasting 



TRANS. AM. ENT. SOC, XLU. 



