HELEODROMIA. 105 



in repose; cubital vein forked ; 3 externo-medial veins proceeding from 

 an oblong hexagonal discal areolet ; costal vein attenuated round the 

 posterior margin. Legs long, slender ; coxae shorter than the femora ; 

 fore coxae large ; empodium thickened in a brush like the onychia. Male. 

 Abdomen linear, terminated by a conical, compressed process. Jem. 

 Abdomen fusiform, terminated by two small lobes. 



The Heleodromia frequent moist ground, ponds, lakes, and 

 rivulets. The species may be grouped thus : 



a. Wings with a stigmatical spot. Species 1. 

 a a. Wings with dusky clouds. Species 2, 3. 

 a a a. Wings immaculate. Species 4. 



1. stagnalis, Hal. e. m. i. 159 (1833); Ct. JFestermanni, Ztt. 

 Cinerea, subtus schistacea, epistomate subquadrato argenteo, antennis 

 nigris, alis subcinereis, venis transversis obsolete fusco-limbatis, halteri- 

 bus fuscis, abdomine supra nigricante maculis cinereis bivittato, femori- 

 bus apice testaceis. Long. 1|- ; alar. 4^ lin. 



Male and Tern. Body olive, slate-colour beneath ; epistoma silvery. 

 Eyes red. Proboscis and antennas black. Wings pale grey; veins 

 black; transverse veins slightly clouded with brown. Halteres brown. 

 Abdomen blackish above, with a row of grey spots along each side. 

 Legs black ; thighs slate-colour, their tips pale red. 



The most common species ; appears in small flights, on ponds, 

 swamps, and running streams, among the crowded starwort 

 (Cattitriche verna), and on duckweed (Lemna). (E. S. I.) 



2. Zetterstedti, Fin. suppl. (1827); Ztt. bipunctata, Hal. ; Ct. 

 Cinerca, subtus schistacea, vitta dorsali fusca, hypostomate lineari ar- 

 genteo, alis puncto stigmaticali fuscescente, pedibus pallide ferrugineis. 

 Long. 1^; alar. 4 lin. 



Cinereous. Hypostoma narrow, silvery. Antennae black. Thorax 

 with a dusky stripe down the middle ; sides pearly grey. Wing* 

 greyish., ivith a brotcn dot beyond the middle of the costa. Discal areolet 

 more attenuate-elongated than in the other species, thus somewhat 

 approaching the genus Wiedemannia ; anal areolet linear and not 

 oval, with an abbreviated but distinct rudiment of the anal vein con- 

 tinued from its apex ; stigmatical dot fusco-ferruginous, somewhat 

 oblong (not round, as in Wied. bistigma). 



Rare ; occurs about rivulets. In Mr. Haliday's collection. (I.) 



3. fontinalis, Hal. e. m. i. 160 (1833); ViWesmcelii, Mq. ; 

 Ztt. Olivacea, subtus schistacea, hypostomate subtrigono argenteo, 

 thorace vittato, alarum costa venisque transversis saturate fusco-limbatis, 

 pedibus posterioribus et femoribus anticis testaceis, his basi fusca subtus 

 trispinosa. Long. 1^; alar. 4 lin. 



Front deep olive ; epistoma silvery. Antennas black. Thorax deep 

 olive, with 2 chestnut stripes divided by a pale line ; underside schis- 

 VOL. i. p 



