4()2 COXXECTICUT GEOL, AND XAT. HIST. SURVEY [Bllll. 



Ormosia Kondani 



1856. Oivnosia Rondani; Prodrom. Dipt. Italicae. 1: 180. 

 1860. Rhypholophibs Kolenati ; Wien. Ent. Monatschr., 4 : 393. 



A very extensive group of essentially Holarctic crane-flies. Euro- 

 pean students tend to separate Ormosia from Rhypholo'phvs^ chiefly 

 on the course of the 2nd Anal vein, but in the local fauna no such di- 

 vision seems feasible. The adult flies occur in small dancing swarms 

 in shaded places, while the early stages live in saturated earth near 

 Avater. 



The chief characters available for separation of many closely 

 allied forms are found in the structure of the male hypopygium (Figs. 

 53,54), It should be emphasized that in this group, as well as many 

 others, the entire ninth segment of the abdomen of the male has under- 

 gone a torsion of approximately 180° so the tergal plate lies on the 

 sternal surface of the body. This plate, in many species, appears as 

 a conspicuous spatula jutting caudad lietween and apparently beneath 

 the basistyles. In manieata it is profoundly incised so as to appear as 

 a sheath on either side. The true relative positions of the various parts 

 can readily be ascertained after detecting the tergite. The outer disti- 

 style is variously formed, and in slide mounts sometimes lies mesad 

 of the true inner style. The outer style is destitute of setae or punc- 

 tures, whereas the inner style has a number of small punctures and 

 often possesses a pale membrane in the axil of curvature or on the 

 concave face. 



Key to Species 

 (Based in part on male characters) 



1. Wings with cell Jsf M, closed (Fig. 50, J) 2 



Wings with cell 1st M-^ open 10 



2. Wings spotted or clouded with darker 3 



Wings unicolorous or nearly so, only the stignial area being darker 5 



3. Anal veins divergent ; wing-markings produced by dark brown spot? and 



blotches on membrane 4 



Anal veins convergent, vein 2nd A before tip bent strongly toward Isl A ; 

 dark markings produced by grouos of dark-colored trichia or very pale 

 gray clouds on membrane (Fig. 50, J) nubila 



4. \\'ings with brown dots in all cells, additional to a series of larger costal 



areas, the latter beyond stigma alternating with pale spots innocens 



Wings with three brown costal spots, the cord narrowly seamed witli 

 brown: apex of wing in outer radial field solidlv darkened apicalis 



5. Anal veins more or less convergent, 2nd A being deflected cephalad on its 



distal third or more 6 



Anal veins divergent ()iiqrihila group) 8 



6. Wings broad (in 9. 7.6x2.8 mm.) ; vein R^ before origin of vein R^; vague 



indications of darker seams along cord and vein Cu cramptoniana 



Wings relatively narrow (width not exceeding 2 mm.) ; vein 7?o distad of 

 origin of R-.; no distinct seams on cord or vein Cu. (Compare also ab- 

 normal specimens of halotricha. having cell 1st Mi closed; see couplet 11) 7 



7. Cell 1st ]\[-2 relatively large, subequal in length to, or only a little shorter 



than, the distal section of vein M.; in-eu shortly beyond fork of M : 

 wing-trichia relatively sparse ; male hypopygium with the two dististyles 

 unequal in. size, the outer very small, subconical in outline (Fig. 53, R) 



arcuata 

 Cell 1st HLj small, about one-half the length of the distal section of vein 

 .1/, ; vi-eii at fork of .1/ ; wing-trichia unusuallv abundant and well-dis- 



