A REVISION OF THE NEARCTIC SPECIES OF CLINOHELEA KIEFF1<:R (DIPrERA: CERAIOPOGONIDAE) William L. Giogaii. Jr.' and Willis W. Wirtlr Abstract. — The seven species of Clino/ielea known to inhabit North America are described and illustrated, and a key is provided for identification. Two species groups are recognized: the unimacu-lata group and the bimaculatd group. Clinohclca longitheca and C. pscudonubifera are new. Clino-Iielea nebiilosn (Malloch) is a synonym of C. rurrici (Coquilh^tt) new synonymy. ClijioJielca Kioffer is a fairh lis of ceratopogoiiids. worldwid mall t^eii-in (listri-i)iition. Little is known of their bioloo^•; hut the adult females are predaceous ou other insects, and the larvae are aquatic. The fiAe ])reviously known North Amer-ican species were described bv Loew (1861), Adams (1903), Coquillett (1905). Malloch (1915), and Wirth (1952). Most of these species were originally described in the genus Ccratopoiron INleigen and later transferred to Palpomyia Meigen, .Johannseniella Williston, or J nliannscno-rnyia Malloch. Although .lohannsen (1943) correctly placed these species in Clinohelea, the North American species have needed comprehensive revision and a good key for identification. In the present paper seven Nearctic species of CUnohclea, two of which are new, are described and illustrated. Two species groups are recognized and given the names of the oldest named species in their group. All of the types of CUnohelca species from North America have been examined, as well as examples of 17 spe-cies from other parts of the world. All specimens examined unless otherwise noted are part of the collection of the Na-tional Museum of Natural History (USNM) in Washington. In the Jists of speciuKMis examined, slide-moimted spe-( imens are denoted (S), and pinned spe-( imens as (P). The types of our new spe-cies will be deposited in the USNM. Measurements and other data are based on slide-moiuited specimens and are re-corded in the manner of Chan and LeRoux ( 1965 ) . When j^ossible, 10 females of each s[)ecies were critically measured. The data are presented in the following man-ner: mean value (mininumi value -maxi-mum value, n = number of measure-ments), except in the case of new species, where the actual values are given for the holotype, and the mean, minimum-maxi-mum, and number of measurements are given in the variation section. Numerical characters for female Nearctic Clinohelea are presented in Table 1. For general terminology of Ceratopogo-nidae see Wirth (1952) and Chan and Le-Roux (1965). The following special terms are used in the descriptions of fe-males. Wing length is measured from the basal arculus to the wing tip. Antennal proportions (AP) are the relative lengths of each flagellomere; antennal ratio (AR) is the length of the proximal 8 flagello-nieres, divided into the length of the distal 5 flagellomeres. Palpal ratio (PR) is the length of the 3rd palpal segment divided Unimacui,.\ta Group curriei 2.53-3.23 nubifera 2.32-2.42 pseudonubifera .... 2.03-2.19 BlMACLILATA GrOUP bimaculata 1.65-2.68 dimidiata 2.32-2.74 usingeri 2.50-2.74 longitheca 1.97-2.00 0.81-0.94 0.71-0.77 n.65-0.69 0.50-0.74 0.68-0.87 0.70-0.81 0.61 0.81-0.87 0.85-0.86 0.82-0.83 0.82-0.86 0.76-0.82 0.80-0.81 0.82-0.84 3.20-4.50 4.00-4.36 2.86-3,00 2.60-140 3.17-3.80 3.17-3.67 2.89-3.11 1.50-1.66 1.41-1.46 1.35-1.38 1.17-1.36 1.25-1.40 1.29-1.35 1.17-1.36 0-3 0-2 1-3 0-3 2-4 0-1 0-1 'Department of Enlomologv, University of Marvlanii. College Park. Maryland 20742. ^Systematic Entomology laboratory. IIBIII. .\p.iA He Sfry . USD.\. i/o U.S. National Mi 20560. 0-3 Washington, D.C. 275
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