COMPENDIUM OF GENERIC DISTINCTIONS. 



799 



OTIOTHOPS. Hinder pair of eyes united. South 



BINOCULINA .Eyes two. 

 NOPS As tribe. Central America. 

 SENOCULINA .Eyes six. 



DYSDBRA. Eyes near each other, in two rows'; first 

 two eyes, second with four. First pair of legs 



SEGBSTRIUM. Eyes in two rows ; front row with 

 hinder with two. Europe. 



Genus. 

 America. 



Trtit. 

 Genus. 

 Trite. 



Genus. 

 row with 

 longest. 



Genus. 

 four eyes, 



Genus. ScYTODKS. Eyes equal, in pairs, forming a triangle. 

 Africa. 



Order. PHALANGITA. Cephalothorax united with 

 abdomen, which is ringed or transversely folded. Palpi thread- 

 like. 



Family. PHALANGID^E. Legs long, feet with one claw. 



Genus. PHALANGIUM. Tarsi with ten or fifteen joints. 

 Second and last pair of legs longest and nearly equal. 



Order. SOLIFUGjE. Cephalothorax distinct from abdo- 

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



Genus. SOLPHUGA. Mandibles double-clawed, lower finger 

 movable. 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. CHHLIFER. 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. PHRYNID^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/E. Abdomen sessile. Palpi with 

 pincers, larger than legs. Six last segments of abdomen nar- 

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

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



Genus. BUTHUS. 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. IXODIDjE. 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. GAMASID^E. Palpi free, thread-like. Man- 

 dibles with pincers. Eyes, none, or indistinct. 



Genus. LEPTUS. Palpi tolerably 'defined, also sucker. 

 Body egg-shaped, soft. 



Genus. GAM ASUS. Mandibles with pincers and toothed. 

 Labium three-cleft. Leathery shield on back. 



Family. ACARIDjE. 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^EMATOPINUS. Antennas eight-jointed, first joint 

 large. Thorax narrower than abdomen. Abdomen flat, legs 

 thick. 



Family. PHILOPTERID^E. Antennse thread-like, three 

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



Genus. TRICHODHCTES. Antennae three-jointed. Tarsi 

 one-clawed. 



Genus. MKNOPON. Head broad. Antenna; shorter than 

 head, club-shaped. Abdomen with ten segments. 



Genus. NIRMUS. Body narrow, head moderate, temporal 

 edges rounded. Antennae not branched. 



Genus. DOCOPHORUS. Head large, nearly triangular, broad 

 at base. Abdomen broad oval. 



Genus. GONIODKS. Head large, body rounded. Antennas 

 sickle-shaped ; in male forming a claw. 



CLASS. MYRIAPODA. 



Head distinct Thorax aud abdomen united Not 

 less than twelve pairs of feet No wings. 



Order. CHILOPODA. Head wide and prominent ; 

 mandibles sharp and curved. A pair of feet on each segment. 



Tribe. SCHIZO TA RSfA . Antennae many jointed, 

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

 pound and globular. 



Family. CERMATIID.A2. Eight dorsal shields, each 

 covering two ventral segments. 



Genus. CKRMATIA. Eyes prominent. Head transverse. 

 Dorsal shields scooped. Hot countries. 



Tribe. HOLOTARSIA. Tarsi mostly three-jointed, 

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

 larger than body. Eyes aggregate, simple or wanting. 



Family. LITHOBIID^. Fifteen dorsal shields, squared, 

 with long, sharp angles. 



Genus. LITHOBIUS. Eyes numerous. 



Family. SCOLOPENDRID^E. Foot-bearing segments, 

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

 second joint spined. 



Genus. SCOLOPENDRA. Head heart-shaped, overlapping. 

 Four pairs of eyes. 



Genus. ENCORYBAS. Antennas nineteen-jointed ; twenty- 

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

 South Africa. 



Family. GEOPHILID^E. Segments nearly equal, numer- 

 ous, each formed of two unequal segments. Last segment with 

 short spiny feet. Antennae fourteen joints. 



Genus. ARTHRONOMALUS. Head squared. 



Genus. GONIBREGMATUS. Head heart-shaped. Philip- 

 pines. 



Order. CHILOGNATHA. Head vertical, rounded. 

 Mandibles thick and strong. Numerous segments, unequal. 

 Feet jointed to abdomen. 



Tribe. PENT A ZONIA .Body oval, contracted at globe, 

 mostly convex above and flat below. Feet fixed to free move- 

 able plates. 



Family. GLOMERID>. 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. POLYXENID^. 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^E. Eyes none, or obscure. 



Genus. POLYDBMUS. Body flattish, rather convex, with 

 horizontal plates at sides. 



