34 ACARIDEA. 
The movable branch of the chele has fewer teeth than in the male; but 
the fixed branch and appendages are similarly formed. 
This is the largest Gamasid known as yet from Central America. In the Cholhuitz 
district near Retalhuleu I found it parasitical upon a very large pectinicorn-beetle, 
Proculus goryi, Guér.; but it cannot be confined to this species only, as the genus 
Proculus is not known to occur in the localities where Mr. Champion obtained his 
It is perhaps parasitic on other Passalide. 
the male. 
specimens of WM. gigantodes. 
2. Megisthanus armiger. (Tab. XIX. figg. 1, 1 ae, 2.) 
Megistanus (sic) armiger, Berlese, Bull. Soc. Ent. Ital. xx. p. 204, t. 9. figg. 1, 1 @ (1888). 
Hab. Mexico, Jalapa (Hége).—Paracuay, Rio Apa. 
Among the dried specimens of Gamaside received from Messrs. Godman and Salvin 
there is one male Megisthanus, collected by Herr Hoge at Jalapa, which I believe to 
belong to the above-named species, as it coincides with the description in all its essential 
characters, as well as in the measurements, though it differs from it in some minor 
details. 
The differences are as follows :— 
Specimen ( 6) from Jalapa (Mexico). 
Scuti dorsualis superficies pilis brevibus e foveolis 
prorumpentibus nec non punctulis impressis 
ornata. In dorsi medio area oblonge tri- 
angularis sulculo lineari circumscripta adest. 
Ante scutum sternale scutulum prosternale, parvum, 
transversum, medio longitudinaliter partitum 
situm est. 
Scutum sternale postice rotundatum, anterius ex- 
cavatum. Scutum ventrale sat ab anali (trans- 
verso quadrilatero) discretum. 
Margo metapodiorum internus excavatus. 
Scuta ventralia omnia setulis brevibus vestita. 
Femora tertii paris inferne calcaribus tribus fere 
obsoletis, quarti paris calcaribus quatuor bre- 
vibus obtusis aucta. 
Cornieuli labiales curvi. 
Trochanter secundi paris superne inermis. 
Cuticula in articulis quarto et quinto secundi, tertii 
et quarti pedum paris ante apicem in dentem 
squamiformem subtus sublevata. 
Articulus palporum secundus dente brevi ante api- 
cem subtus armatus. 
Specimen (3) from Rio Apa (Paraguay), 
as described by Mr. Berlese. 
Scutum dorsuale et margines pilis curtulis vestita. 
(Nothing more mentioned.) 
(Not mentioned.) 
ee eeee rotundatum, in medio tamen sinuatum, anterius 
truncatum. Scutum ventrale ....... parum ab 
anali (triangulari, vertice infero) discretum. 
(Straight in Berlese’s drawing.) 
Metapodia et scutum ventrale setis vestita, cetera nuda. 
Femora tertii et quarti paris inferne calcaribus tribus 
validis aucta. 
Corniculi labiales recti. 
Trochanter secundi paris superne spina valida armatum. 
(Not mentioned.) 
(Not mentioned.) 
