TYRINTHIA.—MALACOSCYLUS. 223 
with a deep depression between the antenne. The same instability is seen in the similar 
structure which distinguishes the genus Phebe. 
' Eight species of Tyrinthia are known, nearly all from Brazil. 
1. Tyrinthia: xanthe. 
Elongata, gracilis, vix convexa, postice paullulum ampliata, sparsim setosa; subtus nigra griseo sericea, supra 
ochraceo-fulva, aureo pubescens, vittis occipitis tribus, altera thoracis dorsali abbreviata, vagis, fuscis ; capite 
inter antennas late concavo, fronte (@) convexa simplici; thorace subtrapezoidali, basi latiore (angulis 
acutis), deinde usque ad apicem gradatim fere recte angustato ; elytris apice singulatim rotundatis, dorso 
striato-punctatis, costulis duabus dorsalibus, carina laterali valde obtusa ; epipleuris versus basin subverti- 
calibus, versus apicem lateribus paullo dilatato-explanatis; pedibus nigris; antennis nigris, articulo 5° 
4°que basi fulvis, seapo gradatim incrassato, articulo tertio valde elongato, cum quarti basi dense nigro 
penicillato. 
Long. 4lin. 9? 
_ Hab. Nicaraeva, Chontales (Belt). 
‘ The specimens collected by Mr. Belt appear to be females; possibly the male may 
have the forehead bicuspid, as in other species of the genus. 
2. Tyrinthia lycinella. 
Lf. wanthe proxime affinis, at postice magis ampliata elytrisque dimidiis apicalibus. nigris; depressa, breviter 
pilosa, subtus nigra griseo sericea, pro- et mesosterno fulvis, supra ochraceo-fulva, elytrorum dimidiis 
apicalibus nigris ; vertice macula, altera utrinque post oculum lineolaque abbreviata thoracis nigris ; capite 
inter antennas late concavo, fronte convexa; thorace angulis posticis acutis, ante basin paullo angustato, 
apud medium iterum dilatato ; elytris apice rotundatis, dorso regulariter usque ad apicem punctato-striatis, 
carina laterali valde obtusa; antennis nigris, articulo 5°, 4° apice, 6°que basi fulvis, scapo medio intus 
dilatato, articulo tertio cum quarti basi paullo incrassato, undique longe piloso sed vix penicillato ; pedibus 
nigris, femoribus 4 anticis (eum coxis) fulvis. 
ong. 32 lin. 9? 
Hab. Costa Rica (Dr. Horn, coll. Bates). 
MALACOSCYLUS. 
Malacoscylus, Thomson, Physis, ii. p. 192. 
The third antennal joint alone in this genus is clothed with long hairs. The elytra 
are convex, with high vertical epipleure, limited above by a strongly-elevated carina. 
Two species have been described, one from Brazil and one from Colombia; but many 
more exist unpublished in collections from Tropical South America. 
1. Malacoscylus humilis. 
Angustus, gracilis, niger, pilosus, fronte genibus prosternoque ante coxas albo tomentosis, vertice vittis duabus 
postice divaricatis et per thoracis latera usque ad elytrorum humeros continuatis aurato-fulvis ; antennis 
nigris, articulo quarto fulvo-testaceo ; thorace subcylindrico, basi latiore ; elytris prope apicem perparum 
ampliatis, apice obtuse rotundatis, dorso punctulato-striatis, sutura et costulis utrinque duabus elevatis, 
carina laterali acutissima ; pedibus nigris. 
Long. 4 lin. So. 
Hab. Mexico, Zacatepec (Salié). 
