788 



COMPENDIUM OF GENERIC DISTINCTIONS. 



CLASS. INSECTA. 



N.B. II no country is mentioned, the insect is British. 



Ringed animals, breathing by trachea Head distinct Legs six, antennae two ; subject to 

 metamorphosis in early stages, mostly developing wings. 



Order. COLEOPTERA. Front wings horny or leathery, 

 concealing the second pair of wings when at rest, horizontal, 

 united down back by straight suture. Hinder of wings mem- 

 branous, folding cross-wise and longitudinally. Mouth with 

 transversely movable jaws. Pupa incomplete. 



Section. PENT A MERA .Tarsi with five joints, fourth 

 of ordinary size. 



Sub-section. ADEPHAGA. Outer lobe of maxilla; dis- 

 tjnct and jointed ; inner edge of lower jaws with strong spines, 

 tip hooked. 



Stirps. GEODEPHAGA.Lt^ long, formed for run- 

 ning ; jaws long, horny, and curved ; eyes prominent. 



Family. CICINDELID^E. Terminal hook of maxilla 

 articulated at base ; head wider than thorax ; mandible long, 

 sharp, and toothed. 



Genus. CICINDELA. Front tarsi of male with three first 

 joints dilated. Wings large. Many lands. 



Genus. MANTICORA. Elytra soldered together. Tarsi not 

 different in sexes. Mandibles projecting and long ; head 

 large. Africa. 



Genus. TRICONDYLA. Wings none. Body long and nar- 

 row. Thorax globular. Hot climates. 



Family. CARABIIVE. Maxilla: not clawed. Labial 

 palpi three-jointed, set on footstalk. Head not wider than 

 thorax. World-wide. 



Genus. CARABUS. Labrum wavy in middle. Thorax 

 squared, edges rounded or slightly heart-shaped. Abdomen 

 oval. Wings not fit for flight. 



Genus. BRACHIWJS. Labrum broad and short. Mandibles 

 projecting, with two basal teeth. Joints of tarsi entire. 

 Thorax short ; elytra broader than thorax and truncated. 



Genus. ANTHIA. Labrum rounded, covering base of large 

 mandibles. Thorax narrow behind. Eyes prominent. Wings 

 absent. 



Genus. LEBIA. Claws of tarsi toothed beneath. Mentum 

 with two lobes ; no tooth. Last joint of labial palpi hatchet- 

 shaped. 



Genus. MORMOLYE. Antenna; very long. Head very long, 

 narrow, especially behind. Elytra short, with lobes wider 

 than abdomen. Java. 



Genus. HARPALUS. Tarsi of four front feet with three or 

 four first joints wide, and heart-shaped. 



Stirps. HYDRADEPffAGA.'L^ for swimming, two 

 latter pairs flat and fringed with hairs. Body oval and mostly 

 flat. Mandibles short and strong. Thorax broader than long. 



Family. DYTICID^E. Front legs short ; antenna? long. 



Genus. DYTICUS. Tarsi of males wide and flat. Eyes at 

 edge of head, which is drawn into the thorax as far as eyes. 

 Last joint of maxillary palpus oval, and larger than others. 



Genus. ILYBIUS. Elytra smooth. Body very convex, 

 narrow between ; second and third joints of labial palpi nearly 

 equal. 



Family. GYRINIDoE. Front legs long ; antennae short. 



Genus. GVRINUS. Antenna; shorter than head, nine- 

 jointed. Eyes divided by lateral edge of head. Elytra not 

 covering tip of abdomen. 



Sub-section. RYPOPHAGA. Palpi four ; antennae more 

 or less complex ; basal joints of male tarsi dilated. 



Stirps. BRA CffEL YTRA .Elytra very short; legs for 

 swimming; antennae increasing gradually to tip. 



Family. STAPHYLINIDjE. Head very distinct ; neck 

 narrow. Antennae set between or in front of eyes. Mandibles 

 long, having on the inside a fringed membranous apparatus. 



Genus. STAPHYLINUS (including Ocvrus and CREOPHILUS). 

 Antennae distant at base. 



Stirps. NECROPHA GA .Elytra mostly covering abdo- 

 men. Antennae often knobbed at tip. 



Family. SILPHID^. Body flat ; head bent rather down- 

 ward. Maxillae two-lobed. Antennas thickened at tips. Legs 

 not contractile. 



Genus. SILPHA. Antennae longer than head, club pear- 

 shaped ; a hook inside maxillae. Head small; thorax broad. 



Genus. NECROPHORUS. Antennae short, club globular. 

 No hook or maxillae . 



Section. CHIL OGNA THOMORPHA .Larvae with long 

 and cylindrical body ; end of abdomen curved under breast. 



Stirps. CLA VICORNES.-Anle.n-nx club-shaped. 



Family. HISTERID^E. Body squared, shining. An- 

 tennas short, elbowed ; club three-jointed. Elytra short ; legs 

 toothed. 



Genus. HISTER. Head small. Elytra shorter than abdo- 

 men, blunt. Head retractile. 



Stirps. LAMELLICORNES.Qxfo of antenna; formed 

 of teeth or plates. 



Family. LUCANID^E. Club-toothed. 



Genus. LUCANUS. Mandibles of male very large, like 

 stag's horns ; those of female, short, sharp, stout, and curved. 

 Club ol antennae four-jointed. 



Family. MELOLONTHID^E. Labrum two-lobed ; man- 

 dibles strong. Maxilla; with several teeth at tip. Club of 

 antenna; formed of flattened plates. Elytra not quite reaching 

 extremity of abdomen. 



Genus. MELOLONTHA. Club with six or seven joints ; 

 claws equal, with basal tooth. 



Family. GEOTRUPIDjE. Maxillary lobes membranous; 

 mandibles projecting. Elytra rounded behind, and covering 

 abdomen. Club large, globular. Thorax broader than long. 



Genus. GEOTRUPES. Antennae eleven-jointed, third joint 

 larger than second; neither thorax nor head armed. Body 

 rounded. 



Family. SCARABEHXE. Clypeus large, concealing 

 mandibles, which have a fringed membranous plate at their 

 tips. Antennas eight or nine-jointed. Body rather flattened. 



Genus. SCARABEUS. Head similar in sexes, not horned. 

 Thorax of male often horned or tubercled. Hot countries. 



Genus. CHALCOSOMA. Head, one horn reflected, toothed 

 behind. Maxillary palpi four-jointed ; labial three-jointed. 

 Thorax three-horned, central very short. Hot countries. 



Family. RUTELID/E. Antennas ten-jointed ; club three- 

 jointed. Mandibles short, horny, notched on outer edge near 

 tip. Maxillae short, with several teeth. Elytra not reaching 

 to end of abdomen. 



Genus. CHRYSOPHORA. Hind legs of male with broad 

 thighs, and tibiz armed with long triangular spur, turned in- 

 wards. Peru. 



Family. DYNASTIDjE. Head or thorax, or both, homed 

 or tuberculated in males. Clypeus small and triangular 

 ! pointed or toothed in front. Jaws strong, horny, toothed. 

 Antennae ten-jointed, club three-jointed. 



Genus. CHELORHINA. Thorax not horned. Head three- 

 horned, the centre horn projecting, curved upwards, and two- 

 cleft at tip. Tropics. 



Section. PRIOCERA TA Antennas serrated. 

 Stirps. MA CROS TERN I. Thorax large and long. 



