18 ACARIDEA. 
Fam. [IXODIDA. 
[C. L. Koch, System. Uebers. tiber die Ordn. der Zecken, in Arch. f. Naturg. x. Jahrg. Bd. 1, 
p. 220 (1844).] 
IXODES. 
Ixodes, C. Li. Koch, loc. cit. p. 231. 
1. Ixodes boarum, sp. n. (Tab. XIII. figg. 1-le; and Tab. XIV. fig. 4, 2 .) 
é latet. 
2. Corpus ovatum, depressum, glabrum, in superficie dorsuali et ventrali abdominis tam sulcis longitudinalibus 
quam punctis impressis instructum ; colore, animalculo vivente, ex csruleo sericeo (in animalculo alcoholo 
preservato sordide ochraceo). Lamine stigmatice obtuse triangulares, stigmate excentrico, rimam 
simplicem oblongam formante. Scutum occipitale latum, parvum, angulis obtusis, nitidum, punctis et 
foveolis raris impressis indutum, colore castaneo uniformi. Oculi nulli. Scutum frontale parvum, 
glabrum, foveis frontalibus carens, colore castaneo. Rostrum parvum, breve, colore late castaneo. Arca 
mandibularis hamulis senis in utroque latere armata, quarto latissimo, quinto longissimo. Arca maxil- 
laris subtus dentibus squamiformibus, rotundatis instructa. Palpi breves, rostrum longitudine haud 
superantes. Pedes graciles, breves, setulis raris armati. 
Long. secundum satietatem varians: 2°5 millim. in jejunis, 5 millim. in satiatis animalculis ; lat. 3°5 millim. 
Hab. Guatemata, Retalhuleu (Séol/). 
Male unknown. Body of the female ovoid, depressed, hairless. ‘The dorsal surface 
of the abdomen shows several linear furrows, arranged in two or three concentrical 
series which radiate from an imaginary centre in the occipital plate. The whole skin 
of the abdomen perforated by a multitude of extremely small punctiform dimples. 
Stigmatic plates very simply built, triangular, with rounded angles, the stigma forming 
a simple excentrical fissure. The occipital plate is small, comparatively broad, with 
obtuse angles, shining, of a uniform chestnut-brown colour, with some punctiform 
dimples, principally on the sides. No eyes visible. The frontal plate small, chestnut- 
brown, devoid of the two frontal grooves or fovee common to the females of Amblyomma. 
Rostrum small, short. Mandibles bearing six hooks on each side, only five of which 
are distinctly visible; the fourth is the broadest, the fifth the longest of all. The 
maxillary teeth are scaly, rounded. The palpi are rather short; the legs comparatively 
short and slender. The total length of the body varies according to the state of 
digestion ; from 2°5 millim. in the empty specimens up to 5 millim. in the satiated 
ones. Breadth 3°5 millim. 
I found about sixty individuals of this species, all of them females, adhering to the 
skin of a Boa imperator, near Retalhuleu. The rudimentary state of the genital orifice 
renders it possible that the specimens are not adult. 
