1925] Guests of Eciton hamatum Collected by Prof. Wheeler 177 
the disc by suture, broad, concave, with the side margins mod- 
erately elevated; a strong impressed line extending from base to 
less than half the distance to anterior border. 
Elytra very strongly gibbous at humeri, sides in front of 
middle concave, then rather strongly arcuate and margined to 
apex; humeral and subhumeral carinse short, thick, and very 
strongly elevated, concave and with a row of coarse punctures 
at top; the two discal carinse less elevated and short, thick and 
punctate above; surface concave at base, rather strongly convex 
behind; large, foveolate punctures sparse and fine punctation 
between more abundant. Propygidium strongly transverse, 
coarsely and rather densely foveolate-punctate. Pygidium very 
sparsely punctate. Prosternum at middle with large elongate, 
rounded, jet black tubercle; sides behind this margined; post- 
erior border strongly excised; surface behind tubercle and the 
frontal lobe coarsely punctate. Mesosternum with three strong 
tubercles similar to those on prosternum, remaining surface very 
coarsely and densely punctate, at middle with a longitudinal 
sulcus. First abdominal segment with punctures smaller and 
more widely separated. Anterior tibiae at margin with a series 
of four strong teeth widely separated; middle and posterior 
tibiae roundly angulate. 
Type locality . — Cacao Tres Aguas, Alta V. Paz, Guatemala 
(Barber and Schwarz). 
The single specimen before me was collected by beating a 
branch. It is badly rubbed and the only pilosity remaining is 
at the lateral borders of the pronotum; the hairs are short, 
rather thick and erect. 
T. mirificus Lewis from Pernambuco is closely related, but 
according to the description has the propygidium and pygidium 
both sparsely punctate, the keel of the prosternum is smooth 
and the first ventral abdominal segment smooth in the middle; 
the middle tibiae of barberi are much less strongly angulate than 
in trilunatus Marseul. 
This is the fourth species in the genus, and all of them, 
both from their systematic position and structure are evidently 
inquilinous, but no host has been recorded. 
