332 Ms C. O. Waterhouse on 
deeply-impressed line. Scarcely any ridge over the base 
of the antenne. Eyes not very prominent. Antenne 
moderately long; the second joint cylindrical, a little 
longer than the first and more slender; the third, fifth 
and seventh joints nearly equal, a little shor ter than the 
second; the fourth, sixth and eighth joints a little shorter 
than the third, fifth and sev enth respectively ; the ninth, 
tenth and eleventh gradually becoming a little stouter. 
Thorax flattened, all the angles rounded; base emarginate. 
Scutellum transverse, truncate at the apex. Elytra im- 
perfectly covering the abdomen, diverging posteriorly. 
Legs long ; anterior tarsi with the four basal joints (very 
gradually decreasing’) subequal; basal joint to the pos- 
terior tarsus as long as the two following together. An- 
terior cox prominent, the prosternum sunk between 
them and channelled; intermediate coxze somewhat 
widely separated from each other; the mesosternum trun- 
cate in front, transversely excavated between the coxe ; 
metasternum very short, with a deep central impression ; 
posterior cox rather widely separated. Teguments 
generally soft. 
Chitoniscus brevipennis, sp. n. 
Piceus, depressus; corpore subtus, femoribusque piceo- 
testaceis. Capite sat lato, nitido, irregulariter haud crebre 
punctulato, clypeo piceo-testaceo. Antennis piceis, articulo 
primo et 9°, 10° et 11° piceo-testaceis, his pubescentibus. 
Thorace dorsim depressiusculo, nitido, sat crebre subtiliter 
punctato, longitudine vix latiori, lateribus rotundatis. 
Scutello piceo-testaceo, subtiliter punctulato. Elytris basi 
thorace paulo latioribus postice ampliatis, striatis; singulo 
elytro margine interno areuato. Abdomine supra nitido, 
impunctato, subtus subtiliter aciculato-punctato, punctis 
setiferis. Pectore nitido, impunctato. 
‘Long. 43 lin.; lat. 14—2 lin. 
Hab.—Tierra del Fuego. Brit. Mus. 
The surface of the ely tra is shghtly wrinkled, and the 
strize (not deeply impressed) are in pairs and not punctured. 
This most curious insect (which from the loose manner 
in which the joints are set reminds one of a Blatta) was 
found in some numbers by Mr. Darwin on the sea-shore 
under stones. 
