712 



ENTOMOLOGY. 



Sfi. I. Cardui. Body greyish. 

 Tingis cardui. Fabricius, Panzer, Latreille. 

 Inhabits thistles. 



Genus CCCLXXX. 2 Aradus. Fabricius, Panzer. 

 Cimex. Linn. Geof. De Geer. 

 Acanthia. Schrank. Wolfi". 

 Coreus. Schellenberg. 



Body depressed. Feet all simple. Antennae with cy- 

 lindric joints, the second articulation longest. 

 Sfi. 1. Lunatus. 



Aradus lunatus. Fabricius, Latreille. 

 Inhabits Europe. 



Family II. Gerrida. 



Feet very long, formed for walking on the water, with 

 the nails very minute, inserted laterally into a fissure at 

 the extremity of the last joint of the tarsi. 



Genus CCCLXXXI. Hydrometra. Latreille, La- 

 marck, Fabricius. 



Cimex. Linnaeus, Geoffroy. 



Aquarius. Schellenberg. 



Antennae setaceous, the third joint much longer than 

 the rest. Anterior feet simple. Head clongatc-cylin- 

 dric, apex thickened. 



Sfi. 1. Stagnorum. Black above; feet brown-reddish. 



Hxjdrometra stagnorum. Fabricius. 



Cimex stagnorum. Linnaeus. 



Aquarius pallidum. Schellenberg. 



Inhabits Europe in moist places. 



GknusCCCLXXXII. Velia. Latreille. 



Cimex. Rossi. 



Hydrometra. Fabricius. 



Antennae filiform, the first joint longest. Anterior 

 feet raptorious. Rostrum two jointed. Head somewhat 

 vertical. 



Sji. 1. Rivulorum. Black; sides of the thorax and 

 margins of the abdomen red. Thorax with two anterior 

 punctures; each elytra with three, and a spot of white; 

 inferior sides of the abdomen punctured with black. 



Hydrometra rivulorum. Fabricius. 



Velia rivulorum. Latreille. 



Inhabits running water and springs. 



Sfi. 2. Currens. Apterous, black. Thorax anterior- 

 ly, with two silky white spots. Middle of the under 

 part of the abdomen, and its elevated margin, with red 

 punctures. 



Velia currens. Latreille. 



Hydrometra currens. Fabricius. 



Inhabits Europe. 



Dr Leach is of opinion, that this is merely the young 

 stake of the preceding species. 



Genus CCCLXXXIII. Gerris. Latreille. 



Cimex. Linnaeus, Ue Geer, Schrank, Geoffroy. 



AquAnius. Schellenberg. 



Hydrometra. Fabricius. 



Antennae filiform, the first joint longest, the last cylin- 

 dric. Anterior feet raptorious. Rostrum three-jointed. 

 Head porreclcd. 



S/i. 1. Pallidum. Brown-olive, black above, cinere- 

 ous, silky beneath. Abdomen nearly equally broad. 

 Trunk as long as the head, carinated beneath, a series of 

 impressed lines on each side. Antennae and feet black. 

 Thorax with an elevated line, extending to the middle 

 of the back. Lateral margins of the thorax and abdo- 

 men with the anus reddish. 



Hydrometra fialudum. Fabricius. 



Gerris fialudum. Latreille. 



Inhabits France, England, and Sweden, 



The species of this genus are certainly but little 

 known; they are either subject to great variation, or are 

 very numerous. 



Tribe VI. Acanthides. 



Labrum prominent. Eyes very large. Feet formed 

 for walking and jumping. 



Genus CCCLXXXIV. Aoanthia. Schrank, Latr. 



Cimex. Linnaeus, De Geer, Geoffroy. 



Salda. Fabricius. 



Lyg^us. Wolff. 



Antennae filiform, Rostrum straight, long. 



S/i. 1. Maculata. Black spotted, with pale colour. 



Acanthia maculata. Latreille. 



Inhabits Europe in moist places. 



Genus CCCLXXXV. Leptopus. Dufour, Latr. 



Antennae setaceous. Rostrum arcuate, short. 



Obs. Of the species we know nothing ; the genus 

 was first observed by Dufour in southern France. 



Section II. Aquatica. 



Antennae very minute, not exserted, inserted beneath 

 the eyes. 



06s. All the insects of this Section live in the water. 



Tribe V. Belostomides. 



Tarsi alike, all cylindric, biarticulated, and furnished 

 With nails. Body depressed. 



Family I. Pelogonida. 



Anterior feet not raptorious. 



Genus CCCLXXXVI. Pelogonus. Latreille. 



Feet all formed for walking. Tarsi cf the anterior 

 pair of feet, with the first joint very short. Body orbi- 

 culate-ovate. Antennae four-jointed. 



Sfi. 1. Marginatus. 



Pelogonus marginatus. Latreille, Gen. Crust, et Ins. 

 3. 143. 



Acanthie bordee. Latreille, Hist. Nat. des Crust, et 

 des Insect. 12. p. 142. 



Inhabits the south of France. 



Family II. Belostomida 



Anterior feet raptorious. 

 Genus CCCLXXXVII. Galgulus. Latreille. 



Naucokis. Fabricius. 



Tarsi of all the feet biarticulate, cylindric, with two 

 strong equal nails. Antennae simple, inserted beneath 

 the internal angle of the eyes, three-jointed. 



Sfi. 1. Oculatus. 



Galgulus oculatus. Latreille. 



Afaucoris oculatus. Fabricius. 



Inhabits Carolina. 



Genus CCCLXXXVIII. Belostoma. Latreille. 



Tarsi of the anterior feet with a simple nail. Anten- 

 nae semi-pectinale, inserted under the eyes, four- jointed. 



Sfi. 1. Tcstacco-fiallidum. Pale, testaceous, eyes oi 

 nereous. 



Belostoma tcstacco-fiallidum, Latreille. 



Inhabits South America. 



Tribe VI. Nepides. 



Anterior tarsi united with the tibiae. Body depressed 

 or linear. 



Family I. A'aucorida. 



Anus without setae. Tarsi of the four posterior feet 

 distinctly biarticulate. Antennae four-jointed. 



