COMPENDIUM OF GENERIC DISTINCTIONS. 



637 



Tribe. PEL TOOEPJB'ALA.—Kea.d shield-shaped, with frontal 

 plates and two flattened antenna'. 



Family. ARGULID.ffi.— Head like circular shield. Antennae 

 short, two-jointed. Second pair of foot-jaws modified into 

 suckers. 



Genus. Argulus. — Oval, flat, transparent, veined; shell 

 notched on either side in front. 



Family. CALIGIDffi. — Feet four pairs, with long hairs. An- 

 tennae flat and two-jointed. Second pair of foot-jaws, not suck- 

 ing discs. Eyes two. 



Genus. Caligus. — Thorax two joints. Small sucking disc 

 on under surface of frontal plates. Fourth pair of feet one- 

 branched, slender. 



Genus. Chalimcs. — Thorax four joints. No sucking disc on 

 frontal plate. 



Family. CECROPIDiE.— Head like small buckler, with frontal 

 plates. One plate-like appendage on upper part of thorax. 

 Ovaries tube-like and twisted. 



Genus. C'ecrops.— Thoracic appendage small and rounded. 

 All feet in male; first three pairs in female for walking. 



Tribe. PACHYCEPHALA.-~Hea.a small, thick, and blunt. 

 Antennae long, five or six-jointed. 



Family. ERGASILIDJE.— Body oval or pear-shaped. Feet 

 very small and branched. 



Genus. Nicothoe. — Antennae slender, many jointed. In 

 female, thorax enlarged into two wing-shaped lobes. Feet four 

 pairs. 



Order. LERNEADA.— Mouth for suction. Thorax not jointed, 

 all its organs very small. Males unlike females. 



Tribe. ANCHOBASTOMACE^: .—Females fixed to prey by 

 strong and hooked foot-jaws. Antennae one pair. 



Family. CHONDRACANTHADiE.— Foot appendages large; 

 foot-jaws three pairs. 



Genus. Choxdracaxtkus. — Body covered with spines. 



Genus. Lerxbntoma. — Egg-tubes long, sometimes stout, 

 sometimes slender and twisting. 



Tribe. ANCHOBACABPACE.E.—T\vo long appendages 

 from thorax, ending in sucking disc or knob. 



Family. LERN^OPOJADa:.— Appendages united at tip. 



Germs. AOTHERES. — Body rounded; head large; egg-tubes 

 pear-shaped. 



Genus. Lerx.eopoda. — In female, body long and oval; head 

 short and thick. Foot-jaws two pairs. Male divided into two 

 nearly equal portions. 



Family. ANCHORELLAD.a:.— Arm-shaped appendages short 

 and united from base. 



Genus. Axchoreli.a. — Female, head at end of very long 

 neck. Foot-jaws three pairs; first and second large, third very 

 small. Egg-tubes moderate. Male very small. 



Tribe. ANCHOBACEBACE^E.— -Females attached to prey- 

 by head, which is held by horns from hinder part. 



Family. PENELLAD.5: .— Several pairs of small feet on under 

 surface of body, near head. 



Genus. Lerx.eoxema. — Body long, slender, narrowed in 

 front and ending in swollen head, with two or three curved ap- 

 pendages. Abdomen long; ovaries long and slender. 



Genus. Pexella. — Body thick; neck narrow; egg-tubes 

 thread-like. 



Family. LERN.a:OCERAD.ffi:. — \o feet or appendages on un- 

 der side of body. 



Genus. LERNyEOCERA. — Body long and straight. Head with 

 horn-shaped appendages, simple, symmetrical. I Ivaries straight. 



Genus. Lerx/Ea. — Body twisted. Horn-shaped appendages 

 branched. Ovaries twisted into round masses. 



Order. PYCNOGON IDES.— Trunk of four segments, a tubu- 

 lar joint at each end, that in front constituting the mouth. Feet 



of male four pairs, of female five pairs; the last pair adapted for 

 bearing the eggs. Marine. 



Genus. Phoxichiliiiium. — Feet very long; two antennae. 

 Pincers. 



Genus. Ptcxogoxom. — Feet hardly longer than body. No 

 pincers. 



Order. XI PHOSU RA.— Shell thick, two-jointed; the junction 

 transverse. Thoracic feet round 1 ith, abdominal feet bear- 

 ing branchiae. A long sharp appendage to hinder shield, 

 jointed to shield and covered with very thick skin. 



Genus. LlMULUS. — Front shield rounded in front; hinder 

 angles sharp and pointed. Hinder shield irregularly hexagonal, 

 with fixed teeth and moveable spines alternating on the sides. 

 Eyes two, sessile, compound, on front shield. Hot seas. 



CLASS.-ARACIINIDA. 



Animals breathing atmospheric air — Antenna? none — 

 Legs four pairs, attached to foreparts of body. 



Order. ARANEIDEA.— Not more than four breathing holes. 

 Abdomen covered with skin. Head and thorax united. Palpi 

 of male swollen at last joint. 



Tribe. OCTONOCULINA.~Y.xes eight. 



Family. MYGALID.S:. — Spinnerets four. Breathing aper- 

 tures four. Falces bent downwards, curved. 



Genus. Mtgai.e. — Eyes ("* •_"). Feet hairy, nearly equal 

 first and fourth pairs largest. Exotic. 



Genus. Atypus. — Eyes on a " watch-tower " in front of eepha- 

 lothoiax. Fourth pair of legs longest. 



Genus. Ctkmza. — Mandible with a row of horny barbes on 

 outer side, near claw. Jamaica. 



Family. LYCOSIDiE. — Spinnerets three pairs. Falces jointed 

 vertically. 



Genus. Lycosa. — Eyes I ' '1. Third pair of legs shortest. 



Genus Dolomedes. — Eyes / , ■■. \. Fourth pair of legs 

 usually longest, third pair \ •' "• / shortest. 



Family. SALTICID.E.— Three pairs of spinnerets. Falces 

 jointed vertically on an inclined plaue. Two breathing aper- 

 tures in front of abdomen and on its lower surface. 



Genus 

 length. 



Salticcs. — Eye 



"(:":) 



Legs stout, variable in 



Genus. Myrmaraciixa.— Head nearly distinct. Skin hard 

 Abdomen swollen in middle. Bengal. 



Genus. Eresus. — Four larger eyes in a square / . ". . V Legs 

 moderate. Nearly equal in length. V • • / 



Family. TH0M1SIDJE.— Three pairs of spinnerets. Tarsi 

 mostly two-clawed. 



Genus. Thomitsus. — Eyes in two rows, one in crescent on part 

 of a circle, with the convexity in front, nearly same size. First 

 and second pairs of legs longest. Lip blunt at tip. 



Genus. Phii.odromus. — Eyes in two transverse rows. Legs 

 long, variable. Lip triangular or oval. 



Genus. Sparassus. — Eyes in two transverse rows, second 

 longer than first. Lip semicircular or oval. 



Family. DBASSID.E.— Three pairs of spinnerets. Tarsi with, 

 two (daws and numerous papillae, or three claws and no papilla. 



Genus. Drasstjs. — Eyes in two transverse rows, alike in size 

 Lip long, oval, rounded at tip. 



Genus. Ci.rmoXA .— Eyes as before, slightly different in size. 

 Lip rather oval or squared. 



