MEGNINIA.—PTEROLICHUS. 4] 
9 
This species lives gregariously as a parasite in the wing-feathers of the “ Cucharon ’ 
(Pteroglossus torquatus) in the tierra caliente of Retalhuleu (Guatemala). 
PTEROLICHUS. 
Pterolichus, Ch. Robin et Mégnin, “ Mém. sur les Sarcoptides plumicoles,” Journ. de |’Anat. et de 
la Physiologie, 1877, p. 398. 
1. Pterolichus momotorum, sp.n. (Tab. XXI. figg. 1, la, b,¢; 2, 24,2.) 
$. Corpus convexum, translucidum, ex albido griseum; marginum circumferentia irregulari inter coxas 
secundi et tertii paris latus utrumque corporis ad lobi instar protrusum, lobulum anteriorem minorem 
atque posteriorem majorem simulans. A basi tertii paris pedum usque ad basin appendicum analium 
corpus crassitudine diminuit. Appendices anales magne, basi lata, margine externo integro, convexo, 
margine interno irregulari, in medio rotunde exciso, sinuato. Appendieule apice sat obtuso, setis duabus 
longis nec non spinis tribus brevibus munite. Disci adhesivi in appendicularum basi siti. Pedes omnes 
inter se equales, eorum tarsus caruncula magna in peduncalo tenui inserta instructus. In dorsi medio 
super coxas secundi pedum paris set quatuor, duc interns breves, due extern longer, site sunt. Spina 
valida recta in latere corporis ante coxas tertiorum pedum. Palpi biarticulati. Mandibule breves, crass, 
earum chels dentibus paucis brevibus armate. In facie ventrali scutum sternale parvum, inter coxas pedum 
anteriorum, atque scutum ventrale, ab illo interstitio clariore separatum, oblongum, distinguuntur. Epi- 
mera angusta, linearia, colore brunneo. Epimera primi et secundi paris oblique versus lineam medianam 
tangentia, sed sese non attingentia, apicibus late separatis. In ventris medio trabecula semicircularis 
ante orificium genitale sita. 
Long. corp. circiter 0°5 millim. 
@. Corpus majus atque longius quam in mari, lateribus ad lobi instar protrusus, post coxas quarti paris cylin- 
dricus, lateribus parallelis, apice rotundato, in medio rotunde exciso, juxta excisionem in utroque latere 
setee dus longe et spine breves due adsunt. Epimera, sete dorsi, palpi, mandibule atque pedes ut 
in mari. 
Long. corp. circiter 0°5-0°75 millim. 
Hab. Guaremata, Retalhuleu (Stol/), in vexillis remigum Momotus lessoni gregatim. 
Body of the male convex, transparent, of a milky-whitish colour; the side-border is 
irregular and projects between the second and third pairs of legs in the form of a 
bipartite lobe; from the base of the third pair of legs the abdomen diminishes in size. 
The anal appendices are large, broad at their bases, convex externally, their inner border 
irregularly sinuated, with a round excavation in its middle; they are rather blunt at 
their tip and each bears two long bristles and three short spines; the adhesive discs 
are situated at their base. On the anterior portion of the back four bristles are 
inserted, and the side-margin bears, at a short distance from the third pair of coxe, a 
straight short spine. The legs are of about equal length and shape, each tarsus bearing 
a large caruncle. The palpi are two-jointed, and the mandibles are short and thick, 
their chele armed with a few short teeth. The ventral surface is divided by a clearer 
interstice into a smaller sternal piece, occupying the space between the anterior coxe, 
and a larger and oblong ventral piece. The epimera form narrow, pointed stripes of a 
brownish colour, which are directed from the side-margin towards the median line of 
the body. 
BIOL. CENTR.-AMER., Arachn. Acar., January 1823. a* 
