388 CALIFORNIA ACADEMY OF SCIENCES. 



versely quadrate, slightly narrower in front, sides feebly 

 arcuate anteriorly and behind, the middle very slightly 

 sinuate, the hind angles acute; disc moderately convex, 

 a vague depression each side, surface closely punctate. 

 Elytra but little wider at base than the thorax, a vague 

 depression on each behind the base, surface closely and 

 coarsely punctate, without traces of costae. Body be- 

 neath more shining than above, metasternum densely and 

 coarsely punctate, the abdomen more finely and not 

 densely punctate. Length .15— .20 inch. ; 3.75-5 mm. 



No sexual differences have been observed. 



Occurs in the entire eastern Atlantic region. 



Ditylus Fischer. 



Body stout. Antennae eleven-jointed, two-thirds the 

 length of the body, the second joint longer than half the 

 third. Head not large, eyes finely granulated and very 

 feebly emarginate, the antennae inserted at a slight dis- 

 tance from them. Last joint of maxillary palpi triangu- 

 lar, the free edge arcuate. Anterior tibiae with two ter- 

 minal spurs. Tarsi with at least two joints spongy-pubes- 

 cent beneath. Claws simple. 



The facies of Ditylus is more robust than any of the 

 other genera of the family. The sexual differences are 

 not well marked in our species and seem to be found in 

 the last ventral segment alone, which is shorter than the 

 preceding segment and very obtuse in the male, while in 

 the female the last segment is longer than the preceding 

 and oval at tip. 



Some of the Mexican species have the head very large 

 in the males, but from Lacordaire's statement the female 

 of the European species has the larger head. 



Three species are, however, in our fauna. 



