28 ACARIDEA. 
et secundi paris unguibus duobus, tertii et quarti paris unguibus tribus armati. Tubercula lateralia valde 
conspicua, oblonga. Mandibule chelate, crasse, in margine externo sub insertione brachii fixi chelarum 
dentibus sex brevibus regularibus ornate. Chelarum brachium fixum curvum, acutum, dente valido ante 
apicem armatum; brachium valde curvum, in medio serrulatum. 
Long. corp. 0°5 millim. 
Hab. Guatemata, Retalhuleu (Stol/). 
Body oblong, convex above, slightly diminishing in size towards the anterior margin, 
which bears two acute cornicles; blood-red, the legs and cornicles slightly coloured ; 
a few short bristles on the dorsal surface, which shows a minute texture consisting of 
thickly-set round or hexagonal grooves, separated by transversely striated interstices ; 
on each side between the second and third pairs of legs there projects an oblong 
tubercle. Anterior pair of legs longer and thicker than the others, which are rather 
slender ; hind legs a little longer than the second and third pairs. The tarsi of the 
two anterior pairs of legs bearing two, those of the third and fourth pairs three claws. 
Mandibles short, thick; the fixed branch of the chele slightly curved, pointed, bearing 
a strong tooth near its apical end; the movable branch strongly curved, its inner edge 
serrulate from the middle to the base ; under the base of the fixed branch the body of 
the mandible shows a row of six short regular teeth. 
Found on one occasion only among fallen leaves in a forest near Retalhuleu. 
Fam. GAMASIDA. 
[P. Mégnin, Monogr. de la famille des Gamasides, in Journ. de l’anat. et de la 
physiologie (1876).] 
Subfam. UROPODIN. 
UROPODA. 
Uropoda, Latreille, Gen. Crust. et Ins, i. pp. 157, 158 (1806). 
1. Uropoda echinata, sp. n. (Tab. XVI. figg. 2, 2 a-2e.) 
Corpus supra et infra convexulum, subglobulare, paullulum longius quam latius, dorsi scutum ovale, corneum, 
colore brunneo, ab corporis margine membrana albido-grisea late separatum, punctulis densis microscopicis 
nec non setis brevibus indutum. In membrana conjunctiva marginali series tres conulorum microscopium 
ostendit, in quorum quoque seta brevis, spiniformis adest. Tarsus pedum paris primi unguibus caret ; 
ceterorum parium ungues graciles, acuti. Palpi simplices, breves, crassi. Mandibule longe protractiles, 
graciles, chelis angustis, parvis. Chelarum brachium fixum mobili sat longius, ad apicem dilatatum, ambo 
brachia dentibus obtusis indistinctis armata. Scutum ventrale convexulum, foveolis punctatum. 
Long. 0°75 millim. 
Hab. Guatemaa, Antigua (Stoll). 
Body almost globular, a little longer than broad; the dorsal and ventral plates chiti- 
