262 GEO. H. HORN, M. D. 



PHYCONOMIIS Lee. 



Head slightly prolonged behind the eyes, then suddenly constricted, 

 front slightly dilated over the base of the antennae. Antennae ten- 

 jointed, last two joints suddenly enlarged and of equal width. Inter- 

 coxal process of abdomen rather wide, broadly arcuate in front. 

 Elytra opaque, irregularly sparsely punctate and opaque. Prosternal 

 sutures distinct. 



This genus seems more closely allied to Monotoma than any other, 

 and in fact follows naturally the last species of that genus in form. 

 The prosternal sutures are nearly as distinct as in Rhizophagus. 

 One species only is known. 



P. marinus Lee, [Monotonia), Proc. Aead. 1858, p. 64; Classification. 

 f). 86. — Moderately elongate, subdepressed, brownish, opaque, sparsely clothed 

 with short whitish hairs. Head opaque, alutaceous, sparsely punctulate. 

 Thorax slightly longer than wide, anterior angles acute, slightly prominent, 

 sides feebly arcuate, gradually narrowed to base, margin erenate, posterior 

 angles obliterated, disc moderately convex, opaque, alutaceous, moderately 

 densely punctulate. Elytra slightly wider than the thorax, opaque, alutaceous, 

 sparsely punctulate. Body beneath opaque, darker in color, sparsely punctulate, 

 nietasternum with subgranular aspect. Length .14— .18 inch; 3.5 — 4.5 mm. 



Occurs on the sea-shore south of San Francisco, under decomposing 

 sea-weeds. 



HESPEROB^NUS Lee. 



Head slightly prolonged behind the eyes and then suddenly con- 

 stricted. Antennae ten-jointed, last two joints suddenly larger, the 

 ninth however not as wide as the tenth. lutercoxal process oval 

 at tip. 



Two species occur in our fauna, one from the Atlantic region, the 

 other in California. 



They are distinguished as follows : 



Elytra with basal third rufous, striae fine, punctures fine and distant. An- 

 terior angles of thorax prominent, disc with very narrow impunctured 

 space abbrevialus Motsch. 



Elytra entirely piceous, strise rather deep, punctures coarser and rather 

 approximate. Anterior angles of thorax not prominent, disc with broad 

 impunctured space rufipes Lee. 



H. abbreviatus Motsch., {Rhizoph.), Bull. Mosc. 1845, iv, p. 371, pi. 7. 

 fig. 3 ; rujipennis Lee, [Monotonia), Proc. Aead. 1858, p. 64. — Moderately elon- 

 gate, subdepressed, piceous, legs, antennae and basal third of thorax rufous. 

 Head rather densely and coarsely punctured. Tliorax longer than wide, sides 

 feebly arcuately narrowed to base, anterior angles acute and moderately 

 prominent externally, hind angles obtusely rounded, margin finely serrulate, 

 disc subdepressed, surface sparsely punctured, at middle a narrow smooth 

 space, at sides densely punctured. Elytra subdepressed, sides very feebly 



