ARACHNOMORPHA.—LISSODERES. 47 
ARACHNOMORPHA, gen. nov. 
Antenne inserted near the base of the rostrum, joints 1 and 2 of the funiculus equal in length, 3-7 short, the 
club ovate, acuminate, with joint 1 as long as the others united ; rostrum arcuate, widened at the base, 
about as long as the head and prothorax as seen in profile; eyes very large, occupying the whole of the 
front of the head, somewhat acuminate below, very narrowly separated, the intra-ocular space wider and 
lanciform above ; prothorax transverse, feebly sinuate at the base, without ocular lobes ; scutellum very 
small, tuberculiform ; elytra short, heart-shaped, with rows of coarse punctures separated by sharp 
ridges; pygidium not visible; mesosternum broad, flattened, gradually declivous; ventral segments 
ascending, 2 shorter than 3 and 4 united; legs long, femora linear, unarmed, the posterior pair extending 
far beyond the apex of the elytra and equalling them in length, tibial claw short, third tarsal joint 
narrowly bilobed, tarsal claws very small. 
Type, A. circumlineata. 
Arachnomorpha includes an isolated form from Chiriqui. It is related to Mnemyne, 
Pasc. 
1. Arachnomorpha circumlineata, sp. n. (Tab. III. figg. 23, 23 a, b.) 
Ovate, shining, black, the antenne in part ferruginous; the prothorax with a narrow stripe on each side, 
which is continued along the sternal side-pieces and across the second ventral segment, and a posteriorly 
widened median vitta, the elytra with a mesially interrupted sutural stripe, and the under surface 
(ventral segments 3-5 excepted), clothed with coarse, oval, white, opalescent scales, the base of the 
rostrum and the legs with small, narrow, hair-like, white scales. Rostrum sparsely, minutely punc- 
tate, carinate and rugulose at the base. Prothorax much broader than long, somewhat rounded at the 
sides, narrowed and feebly constricted in front; coarsely, closely punctate, smooth along the anterior 
margin. Elytra coarsely crenate-striate, the interstices sharply and equally costate throughout. Beneath 
rather coarsely punctate. 
Length 23, breadth 12 millim. 
Hab. Panama, Bugaba (Champion). 
One specimen. In this insect the marginal line of coarse white scales on the prothorax 
is continued right round the sides of the body beneath. 
LISSODERES, gen. nov. 
Antenne inserted at a little beyond the middle of the rostrum, joint 2 of the funiculus shorter than 1, 3-7 
short, the club ovate, with joint 1 about as long as the others united; rostrum very stout, curved, 
scarcely longer than the prothorax as seen in profile, explanate at the apex, the scrobes deep, rapidly 
descending, and also continued forwards; mandibles stout, bifid at the tip; eyes very large, occupying 
the whole of the anterior portion of the globose head, contiguous in front, narrowly separated above ; 
prothorax subcylindrical, truncate in front, bisinuate at the base; scutellum rather large ; elytra short, 
wider than the prothorax, broadly truncate at the apex; pygidium covered ; anterior coxe with a conical 
tubercle; mesosternum declivous, unimpressed, the meso-metasternal suture straight ; mesothoracic epimera 
narrow ; ventral segments ascending, 2 about as long as 3 and 4 united; legs rather slender, femora 
linear, shallowly sulcate beneath, unarmed, the posterior pair as long as or longer than the elytra, tibize 
compressed, the claw long, tarsi long, their third joint narrowly bilobed ; body oblong, in part glabrous 
above. 
Type, L. subnudus. | 
The above characters are taken from a single species from Chiriqui. The cylindrical, 
sparsely punctulate prothorax, the truncate, crenate-striate elytra, the short, stout, 
apically widened rostrum, the linear, unarmed femora, and the almost glabrous, shining 
upper surface, give it a peculiar facies. 
