430 



BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



found in the form and particularly in the sculpture. My first impres- 

 sion was that it belonged in Hippodamia but the pronotum is much 

 more like that of Coccinella and it seems better to place it in the latter 

 genus for the present. The outline was probably similar to that of 

 the recent C. trifasciata and less rotund than in the Florissant fossil 

 C. sodoma. The generic reference must be understood in the broad 

 sense, as it is not likely that the insect was a true Coccinella. 



EROTYLIDAE. 



Tritoma diluviana, sp. nov. 

 Plate 1, fig. 5-6. 



Form elongate, much like the recent T. f estiva. Under surface of head 

 closely, and, relatively to the size of the insect, moderately coarsely 

 punctured at the sides. Eyes elliptical as seen from below, of normal 

 size. Antennae about equal in length to two thirds of the prothoracic 

 basal width, club composed of three subequal joints. Prothoracic 

 length at middle about four sevenths of the basal width, sides con- 

 vergent anteriorly and nearly straight in the type, apex about one fifth 

 narrower than the base, front angles prominent, punctuation finer than 

 that of the head. Meso- and metasternal areas obscurely punctate. 

 Abdominal punctuation moderately coarse but shallow and well sepa- 

 rated. Legs not preserved. Length, 5.25 mm., in life a little less. 



Described from one specimen showing the underside. 



Type.— No. 2,442 M. C. Z. Florissant, Col. (No. 4,512 S. H. Scud- 

 der Coll.). No. 2,443 M. C. Z. (No. 9,097 S. H. Scudder Coll.) is 

 evidently the same species though not the counterpart of the type. 



In the second specimen, the sides of the prothorax are well preserved 

 and are seen to be regularly but gently rounded from the base similarly 

 to the recent T. thoracica or T. flavkollis. This species is easily dis- 

 tinguished from the Florissant fossils T. materna and T. submersa by 

 its greater size and more elongate form. 



COLYDIIDAE. 



Rhagoderidea, gen. nov. 



General outline of Rhagodera, but with the margins entire or nearly 

 so. Elytral sculpture weaker than in Rhagodera, striatopunctate. 



