BACTRIDIUM. . 579 
2. Bactridium adustum. 
Rhizophagus adustus, Reitter, Verh. Ver. Briinn, xi. p. 389 (1872) '. 
Bactridium adustum, Reitter, Deutsche ent. Zeitschr. xx. p. 299 (1876) °. 
Bactridwum sp., Champ. Trans. Ent. Soc. Lond. 1898, p. 410°. 
Hab. Norru America?!—Muexico, Teapa? (coll. Oberthiir); British Honpuras 
(Blancaneaua); GuaTemaia, Chiacam and Chacoj in Vera Paz, Guatemala city, Zapote, 
El Reposo, Cerro Zunil (Champion).—Antitues, Grenada and St. Vincent. 
This insect, though widely distributed, seems to be rare, and we have only one, two, 
or three individuals from each locality. If I am right in treating all of them as one 
species, it is a variable form. It has the peculiarity that in the male sex the first 
ventral segment has a setigerous puncture on each side just within the coxal line. 
These punctures are, however, apparently absent in the case of a large male from 
Zapote, which I was inclined at first to separate as a distinct species under the name of 
B. staphylinum. Small, narrow, pallid examples, with a faint thoracic depression, also 
appear to differ considerably. Two of these found at El Reposo may possibly be 
distinct. A large unicolorous specimen found at Cerro Zunil scarcely differs from the 
type of B. angulicolle, Reitter (from Cuba), except that it lacks the slight angulation of 
the side of the thorax described by the name of the Cuban form. A specimen from 
Colombia, also kindly sent by M. Oberthiir, has a stronger punctuation on the thorax. 
I think it impossible at present to decide whether there is really more than one species 
amongst this material. 
3. Bactridium brevicorne, sp. n. 
Breve, haud depressum, nitidum, rufum, elytris flavis; prothorace transversim subquadrato, dorso subdeplanato, 
ante basin parum perspicue depresso ; elytris subtiliter seriatim punctatis. 
Long. 13 millim. 
Hab. Panama, Bugaba (Champion). 
Antenne extremely short. Head with minute free angles behind the eyes; finely 
punctate. ‘Thorax not so long as broad, the angles not rounded, the disc moderately 
coarsely punctate, without distinct smooth space, but a little flattened, and, when seen 
from in front, the punctures at the base form an obscure series, curved and scarcely 
visibly depressed. Elytra with regular series of fine punctures. Under surface with 
very little sculpture. Coxal lines very short. Three specimens. 
4, Bactridium crassum, sp. n. 
Convexum, nitidum, rufum, thorace nigro vel piceo, basin versus angustato, haud impresso ; elytris subtiliter 
seriatim punctatis. 
Long. 2-22 millim. 
Hab. Guatemata, Capetillo (Champion). 
Antenne with very large club. Head finely punctate, eyes well separated from the 
