BuackBurN AND SHarr—On some New Species and Genera of Coleoptera. 157 
Fam. MALACODERMIDA. 
HELCOGASTER. 
Helcogaster pectinatus, n. sp.—Depressus, niger, nitidus, subglaber, antennis 
basi testaceo, articulis 5-10 breviter pectinatis. Long. 4 m.m. (Plate tv., 
f. 20.) 
Antennz longer than the head and thorax, the two or three basal joints 
yellow, the rest dark; second joint almost globular; third triangular; fourth 
somewhat produced inwardly; five to ten giving off each inwardly a well- 
marked, stout process acuminate at its extremity; terminal joint simple; head 
much narrower behind the prominent eyes; thorax black, smooth, and shining, 
about as long as broad; hind angles quite rounded, base strongly margined ; 
elytra abbreviate, leaving exposed four of the segments of the hind body, and an 
emarginate terminal process, obsoletely punctate; exposed segments smooth and 
shining ; black, with a narrow, white, membranous margin at the side. 
This species differs from the recorded Australian species of Helcogaster by the 
pectinate antenne, but this at present would scarcely justify its being treated as a 
distinct genus. Mr. Gorham has kindly looked at a specimen, and informs me it 
is unknown to him. 
No. 824, Found in the town of Honolulu. 
CaccoDEs (nov. gen.). 
This genus is formed for a minute beetle having the appearance of our 
European Malthodes, but with the elytra very short, dehiscent, scarcely covering 
one-half of the hind body, and with the mandibles toothed internally near the 
extremity ; in most other respects, so far as I can observe, the characters are but 
little different from those of Malthodes ; the palpi are short, with acuminate extre- 
mity, the prosternum extremely short, the antennz elongate and filiform, the hind 
wings ample and exserted. 
D. 8. 
Caccodes debilis, n. sp.—Fusco-niger, capite pedibusque testaceis, antennarum 
basi tibiisque fuscis; antennis sat crassis, corpore longioribus ; prothorace fortiter 
transverso; elytris abbreviatis, fortiter dehiscentibus, obsoletissime punctatis. 
Long. 2} m.m. 
Antennee with the second and third joints rather shorter than the others, the 
third rather the longer, four to eleven differing little from one another in length ; 
each slightly narrower than its predecessor, so that the acuminate terminal joint is 
evidently thinner than the fourth joint; head, thorax and elytra bearing an 
extremely short and fine, not dense, pubescence; eyes large and prominent, head 
