COMPENDIUM OF GENEETC DISTINCTIONS. 



801 



Tribe. BINOCULTXA. Eyes two. 



Genus. Nora As tribe. Central America. 



Tribe. SENOCULINA.T&yes six. 



Genus. DYSDEBA. Eyes near each other, in two rows ; 

 first row with two eyes, second with four. First pair of 

 legs longest. 



Genus. SEGESTRIDM. Eyes in two rows ; front row with 

 (our eyes, hinder with two. Europe. 



Genus. SCYTODES. Eyes equal, in pairs, forming a 

 triangle. Africa. 



Order. PHALANfSITA. Cepbalothorax united with 

 abdomen, which is ringed or transversely folded. Palpi 

 thread-like. 



Family. PHALANGIDJE. Legs long, feet with one claw. 



Genus. PHALANQIUM. Tarsi with ten or fifteen joints. 

 Second and last pair of legs longest and nearly equal. 



Order. SOLIFUGJE. Cephalothorax distinct from 

 abdomen, which is ringed. Palpi as long and large as legs. 



Genus. SOLPHUGA. Mandibles double-clawed, lower 

 finger moveable. Palpi longer than first pair of feet. All 

 feet but first pair with two claws. Eyes two, on a tubercle. 

 Hot countries. 



Order. PSEUDOSCORPIONES. Cephalothorax 

 united to abdomen. Abdomen ringed. Palpi large, with 

 pincers at tip. 



Genus. CHELIFER. Eyes two. Cephalothorax divided 

 by transverse furrow. 



Genus. OBISIUM. Eyes four. Cephalothorax not 

 divided. 



Order PEDIPALPI. Palpi foot-like, with pincers at 

 tip. Abdomen divided by segments. Breathing orifices 

 eight or four. 



Family. PHEYNID^E. Slight groove between abdomen 

 and Cephalothorax. Palpi spined. Eyes eight. Two front 

 feet long, without pincers. 



Genus. PHRYNUS. Palpi long as body, with horny claws 

 at tip. First pair of legs very long and slender. Body 

 rather flat. 



Family. SCORPIONID.ffi. Abdomen sessile. Palpi with 

 pincers, larger than legs. Six last segments of abdomen 

 narrowed, last segment with curved sting. Two comb-like ap- 

 pendages on lower part of body, behind fourth pair of feet. 



Genus. BCTHUS. Eyes eight, three lateral on each side 

 of Cephalothorax. 



Genus. SCORPIO. Eyes six. Two lateral on each side. 



Order. ACARINA. Cephalothorax and abdomen 

 united, not divided into segments. 



Family. IXODID^!. Body with leathery covering. 

 Beak blunt, toothed at tip, barbed at middle. Last joint 

 of feet two-clawed, with vesicle. 



Genus. IXODES. As Family. 



Family. GAMASIDJE. Palpi free, thread-like. Man- 

 dibles with pincers. Eyes none, or indistinct. 



Genus. LEPTUS. Palpi tolerably defined, also sucker. 

 Body egg-shaped, soft. 



Genus. GAMASUS. Mandibles with pincers and toothed. 

 Labium three-cleft. Leathery shield on back. 



Family. ACARID./E. Head terminated in front by a 

 scooped lip, or a single two-cleft projection. Palpi indistinct. 

 Mandibles with pincers. Eyes none distinct. 



Genus. ACARUS. Body divided by a transverse furrow 

 between second and third pairs of feet. Four of the legs 

 close at their bases. 



Family. PEDICULID.E. Mouth composed of small re- 

 tractile beak, attached at base. Tarsi with a single 

 arched claw. 



Genus. H.&MATOPINUS. Antennae eight-jointed, first 

 joint large. Thorax narrower than abdomen. Abdomen 

 flat, legs thick. 



Family. PHILOPTERID.ffi. Antennae thread-like, three 

 or five-jointed. Mandibles strong. No maxillary palpi. 



Genus. TRICHODECTES. Antennas three-jointed. Tarsi 

 one-clawed. 



Genus. MENOPON. Head broad. Antennae shortei than 

 head, club-shaped. Abdomen with ter? segments. 



3. 3 



Genus. NIRMUS. Body narrow, head moderate, tem- 

 poral edges rounded. A ntennae not branched. 



Genus. DOCOPHOROS. Head large, nearly triangular, 

 broad at base. Abdomen broad oval. 



Genus. GONIODES. Head large, body rounded. Antennw 

 sickle-shaped ; in male forming a claw. 



CLASS MYEIAPODA. 



Head distinct Thorax and abdomen untied Not less 

 than twelve pairs of feel No wings. 



Order. CHILOPODA Head wide and prominent; 

 mandibles sharp and curved. A pair of feet on each seg- 

 ment. 



Tribe. SCHIZOTARSTA. Antennae many-jointed, 

 slender, larger than body. Legs long, unequal. Eyes com- 

 pound and globular. 



Family. CERMATIID.ZE. Eight dorsal shields, each 

 covering two ventral segments. 



Genus. CERMATIA. Eyes prominent. Head transverse. 

 Dorsal shields scooped. Hot countries. 



Tribe. HOLOTAR$IA. Tarsi mostly three-jointed, 

 rarely twelve-jointed. Head of two segments. Antennae not 

 larger than body. Eyes aggregate, simple, or wanting. 



Family. LITHOBIID.ffi. Fifteen dorsal shields, squared, 

 with long, sharp angles. 



Genus. LITHOBIUS. Eyes numerous. 



Family. SCOLOPENDKID-ffi. Foot-bearing segments, 

 twenty-one or twenty-three. Hinder feet thickened, first 01 

 second joint spined. 



Genus. SCOLOPENDRA. Head heart-shaped, overlapping. 

 Four pairs of eyes. 



Genus. ENCORYBAS. Antennae nineteen-jointed; twenty- 

 one pairs of feet, last largest, and developed into leaping 

 plates. South Africa. 



Family. GEOPHILID.2E. Segments nearly equal, 

 numerous, each formed of two unequal segments. Last seg- 

 ment with short, spiny feet. Antennae fourteen joints. 



Genus. ARTHRONOMALUS. Head squared. 



Genus. GONIBREGMATOS. Head heart-shaped. Philip- 

 pines. 



Order. CHII.OGNATHA. Head vertical, roandod. 

 Mandibles thick and strong. Numerous segments, unequal. 

 Feet jointed to abdomen. 



Tribe. PENTAZONIA. Body oval, contracted at 

 globe, mostly convex above and fiat below. Feet fixed to 

 free moveable plates. 



Family. GLOMERID^E. Body smooth. Eyes distinct. 



Genus. ZEPHRONIA. Eyes numerous, aggregated. An- 

 tennae club-shaped, six or seven-jointed. Twenty-one pairs 

 of feet. Tropical countries. 



Genus. GLOMERIS. Eyes eight, in a curved line. Thirteen 

 segments, seventeen pairs of feet. 



Tribe. MONOZONIA . Body long and worm-like. 

 First half of each segment cylindric, second half with 

 widened sides. On each segment a double plate carrying 

 two pairs of feet. 



Family. POLYXENIL^!. Head arched and prominent ; 

 body wide. Long tuft at end of abdomen. 



Genus. POLYXENUS. Body short, covered with minute 

 pencils of scales. Thirteen pairs of feet. 



Family. POLYDESMID^!. Eyes none, or obscure. 



Genus. POLYDEMUS. Body flattish, rather convex, with 

 horizontal plates at sides. 



Tribe. BIZONIA. Body cylindric, no plates on sides. 

 Antennae club-shaped, seven-jointed. Many segments, each 

 formed of two fused segments, and bearing two pairs of legs. 



Family. JULID.33. Feet fixed to immoveable plates. 



Genus. JULUS. Head convex. Autenna^ long. Sides of 

 prothorax triangular. 



Genus. SPIROSTREPTES. Antennae short, with funnel- 

 shaped joints. Eyes transverse. Sides of prothorax lenrth- 

 Bcod or widened. Asia. 



