War. 1899] Fall: On American Species of Acm.^odera. 35 



Habitat : Occurs in California from Siskiyou to Los Angeles and 

 San Barnardino Cos. 



ACI\L«ODER.« LOBAT.B. 



Two species are here added to gibbula which alone formerly con- 

 stituted this group. They agree in having the prosternum more or 

 less prominently lobed at middle, the sides reaching the front angles. 

 They are not otherwise closely related, ciibcecola indeed being de- 

 cidedly aberrant. 



They easily separate as follows : 



Prosternal lobe less prominent, rounded, not emarginate ; last ventral without apical 



crest cubscola. 



Prosternal lobe more prominent, angulate at sides with the summit emarginate ; last 

 ventral with apical crest. 

 Elytra not carinate, not produced at apex, yellow spots much larger and less 



numerous gibbula. 



Elytra caudate, third and fifth elytral intervals subcarinate in basal half, yellow 

 spots much smaller and more numerous grif f ithi. 



A. cubaecola Duv., Ins. Cuba, 1857, p. 57. 



Depressed, opaque, rusty black, elytra variegated with yellow. Thorax wider 

 than the elytra, very coarsely cribrately punctate, hind angles broadly yellow above, 

 more narrowly beneath. Elytra with closely placed striffi of coarse rounded punc- 

 tures, intervals narrow, not well defined. Beneath coarsely punctate, the abdomen 

 less coarsely so toward the tip, the last ventral without crest. Prosternum with short, 

 broad median lobe, truncate with rounded angles. Length, 6-7 mm., .25-28 inch. 



Habitat : One example from the National Museum labelled Key 

 Largo, Fla. ; another kindly given me by Mr. Henry Wenzel is labeled 

 simply " Fla.," but is doubtless also from one of the Keys. 



This species even more than ciiprina possesses a facies that stamps 

 it at once as an interloper. In only one other species — robusta — is 

 the margin of the thorax in part yellow beneath as well as above, and 

 in no other are the punctures at the middle of the first abdominal 

 segment coarser than at the sides and apex. 



A. gibbula Lee, Proc. Acad. Sc. Phil., 1858, p. 69; delumbis 



Horn, Proc. Cal. Acad. Sci., IV, p. 378. 



This species is generally well known and needs little comment. 

 The punctuation of the thorax and abdomen varies somewhat in den- 

 sity, and the thorax is either unspotted or with two marginal spots. 

 The ventral plate is truly apical, giving the appearance of a double 

 margin; it is thin and nearly hyperbolical' in outline. I have care- 

 fully compared the types of delumbis with a long series of gibbula and 



