1 | * " 2d i LUM 
MEN N yy w^J* .-— pst x Jj 
120 Scientific Intelligence. 
The following are the families thus deduced, with the genera of 
Corystoidea and their characteristics. 
FaAw. .. TRICHOCERIDJE. 
Carapax formá Cancroideus, fronte non rostratus. Antenna internze 
longitadinales. . Antennz externz breves, flagello parce piloso.  Max- 
illipedes externi super epistoma non producti, sed margini arez buccalis 
bene adaptati. 
————— 
Gen. 'T'RiIcHocERA, DeHaan.*—Frons dentatus. Articulus maxilli- 
pedis externi 3tius apice truncatus. Articulus antennarum ex- 
ternarum 1mus elongatus, hiatum orbitze bene occupans. 
Faw. II. 'THIIDZE. 
Carapax suborbicularis, non oblongus, fronte non rostratus.  Anten- 
nag interna transverse vel oblique. — Antennz externz breves, flagello 
parce piloso. Maxillipedes externi super epistoma producti. 
Gen. 1. "Tura, Leach.—fFrons integer, areuatus. Ántennz interne 
transverse. Pedes nulli natatorii. Articulus maxillipedis ex- 
terni 3tius vix oblongus. 
Gen. 2. Knavussia, Dana.t ^ Carapax paulo transversus, margine 
postero-laterali brevi, fronte denticulato, medio emarginato. An- 
tenns internae oblique. — Pedes 8 postici natatorii, tarso. falei- | 
formi. Articulus maxillipedis externi 3tius vix oblongus. | 
FaAw. III. CORYSTIDAE. 
Carapax sive suborbicularis sive multum angustus, fronte plus mi- 
nusve rostrato. Maxillipedes externi super epistoma producti. 
1l. Pedes nulli natatorii. 
G. 1. TErLwsssus, White.j—Carapax parce transversus, pone me- 
dium latior, fronte paulo producto et medio emarginato. Articulus 
antennarum externarum lmus elongatus, processu elongato hia- 
tum orbitee bene occupans. Articulus maxillipedis externi 8tius 
parce oblongus apice triangulatus, articulum 4tum prope apicem 
gerens. à; 
G. 9. ArELECYCLUS, Leach.S —Carapax fere orbicularis, lateraliter 
arcuatus, fronte paulo producto. Articulus antennarum exter- 
* Faun. Japon. (1833), p. 16. 
1 Ad species complectendum Xantho integrum Haanii, (Faun. Japon. 66, tab. 18, 
f. 6) et Platyonychwum rugulosum Kraussii (* Südaf. Crust." 26, tab. 1, f. 5), Thize affines 
et Xantho remotas, genus * Kraussia" institutum est. Platyonycho discrepat mar- 
gine postero-laterali breviore quam antero-lateralis, carapace paulo transverso, fronte 
bilobato et denticulato, flagello antennarum internarum subpiloso. An Zéchocera 
porcellana (A. White, * Voy. Samarang," p. 59) a Kraussii specie differt ? 
1 A. White, * Ann. Mag. Nat. Hist." xvii, 497, 1846; Voy. Samarang, 14, tab. 3. 
-Atelecyclo, habitu, antennis aliisque, Kraussia affinis: ejus affinitas Maioideis, ab 
Adamsio White edita, justa non videtur. * 
8 Chlorodius Haanii, Faun. Japon., 13. 
