254 GEO. H. HORN, 



lustrous surflice becoming paler only by evident immaturity. The 

 two brownish species have a bhick head, although in Blanchardi the 

 sides of the head in front of the eyes are very pale, as is the case in 

 all the pale species of Philydrus. Color is as constant a character 

 here as been observed in Philydrus and the only difficulty may re- 

 sult from the lack of skill on the part of an observer in prcjperly 

 distinguishing what is an immature specimen of a piceous species, or 

 a discolored example of a brown one. 



With these preliminary remarks the student will be enabled to 

 separate the species by the aid of the following analytical table. In 

 counting the striae reference is made only to those which exist as such 

 and not to the traces seen through the elytra when these are pale oi* 

 immature in color. 



Elytra with distinct strife. 



All the strife entire; mesosterual transverse ridge straight and feebly elevated. 



ptiiictatostriala. 



Inner striae much abbreviated. 



Six outer strife entire, seventh nearly so; mesosternal ridge angulate and 

 elevated at middle, when viewed posteriorly in form of A. PI. iii, 



fig. 18d rratorciilns. 



Five outer strife entire; mesosternal ridge straiglit, transverse, feebly ele- 

 vated ; color piceous, with paler border; coarse punctures of alter- 

 nate intervals indistinct (lorsalis. 



Four outer strife only entire; mesosternal transverse ridge arcuate, feebly 

 elevated; color as in dorsaiis ; coarse punctures of alternate inter- 

 vals distinct PI. iii, fig. 18c iiioi'Hta. 



Four outer strife only entire and very feebly impressed ; me.sosternal ridge 

 feebly elevated, arcuate; color piceo-ochraceous or pale castaneous, 



head black, thorax with large piceous spot iilibellis. 



Elytra without strife (excejit the sutural). 



Form oval: mesosternal ridge well marked: serial punctures of elytra distinct, 

 at least at the sides. 

 Piceous broadly oval ; mesosternal ridge angularly elevated at middle in the 



form of A roliinda. 



Piceous, less broadly oval ; mesosternal ridge straight, transverse, feebly 



elevated. PI. iii, fig. 18b fiitibriata. 



Piceo-ochraceous, head black, with a large yellow spot in front of each eye; 



mesosternal ridge as in fimbriata Blaiicliardi. 



Form oblong; mesosternal ridge very short, transverse; coarse serial punc- 

 tures of elytra absent; piceous with paler border. PI. iii, fig. 18a. 



lacuMfris. 

 C puiietatostriata Horn. — Form rather broadly oval, scarcely narrowed 

 in front, subdepressed, piceous shining, the entire border somewhat jialer. Tho- 

 rax closely and evenly punctate, the anterior arcuate and the transverse series 

 of coarser punctures distinct, but of few punctures, ba.sal marginal line absent. 

 Elyti'a with ten entire strife and a short scutellar row of punctures, strife moder- 



