24 GEO. H. HORN, M. D. 



FORNAX Cast. 



Form variable, but usually oblong, and more or less cylindrical ; antennae 

 variable in length, usually serrate ; head convex, deeply inserted, the eyes mod- 

 erately large and encroaching upon that part of the antennal groove extending 

 on the head ; clypeus narrowed at base, but variably, the apical margin truncate 

 at middle, sinuate each side ; mandibles presenting a rather broad rugose face ; 

 prothorax of variable form, usually narrowed in front, the hind angles more or 

 less prolonged; prosterual sutures distinct, slightly divergent, the triangle 

 broad, usually as broad at base as long, the antennal grooves deep, sharply limited 

 on each side, much narrower than the triangle, usually parallel (wider in front 

 in infelix) ; elytra striate ; metasternal episterna moderate, parallel, the epimera 

 not visible ; hind coxal plates widely dilated internally ; last ventral segment 

 obtuse ; tarsi filiform, the first joint of the posterior pair as long as all the others, 

 the fourth broader, excavate above and slightly lobed beneath ; claws toothed 

 in the larger species, simple or slightly broader in the smaller. 



The species of this genus are confined to the Atlantic region of 

 our fauna, and are of rather homogeneous aspect. It is very closely 

 related to Dromasolus, and separated by characters which seem in- 

 clined to be evanescent. The only species possessing remarkable 

 characters is infelix, these are alluded to in the description. 



The characters of the following table will readily distinguish our 

 species : 



Second joint of antennse as long, or very nearly as the fourth 2. 



Second joint small, not half as long as the fourth 3. 



2. — Front without trace of interocular carina ; color pale castaneous-.basalis. 



Front transversely carinate between the eyes ;" color piceous Horiiii. 



3. — Epipleurae not grooved 4. 



EpipleursE grooved and smooth 5. 



4. — Interocular carina entire, color piceous; species small ealeeattis. 



Interocular carina wanting; species large 6. 



5. — Antennae slender, not serrate ; interocular carina extending slightly on the 



base of the clypeus bicolor. 



6. — Lateral margin of thorax single. 



Antennae serrate on joints 4-8, the last three more slender and not ser- 

 rate inolestus. 



Antennae serrate on joints 4 -10, the last joint alone slender. 



orehesides. 

 Lateral margin of thorax double. 



Antennae a little shorter than half the body and feebly serrate. .iiiftli-X. 



F. badius Mels. — Form moderately elongate, somewhat narrower posteri- 

 orly, castaneous brown, feebly shining, clothed with short fulvous pubescence ; 

 antennae slender, a little longer than the head and thorax, first joint moderately 

 stout, slightly arcuate, as long as the three following, second a little longer than 

 the fourth, third nearly as long as the next two, fourth a little shorter than the 

 fifth, joints 5-10 nearly equal, eleventh a little longer; head convex, with a 

 moderate, but dense punctuation ; clypeus half as wide at base as at apex, the 



