THE GENUS DENDROCTONUS. Ill 



evidence that the characters and locality were not involved in the 

 revised description under D. rufipennis. It is probably represented 

 in the Horn collection (A. E. S.) by one specimen, without locality 

 label, found by the writer in 1900 as the third specimen in the type 

 series, under D. approximatus. Two other specimens, labeled "Colo.," 

 were found in the* Horn collection and one specimen in the general 

 Aejulemy of Natural Sciences collection under D. rufipennis. The 

 two in the Horn collection were evidently before Dietz when he pre- 

 pared his revision under D. rufipennis and included in the Colorado 

 locality if not in the revised description. The writer (1902, p. 10) 

 refers in a footnote to wrong identifications under D. rufipennis and 

 D. terebrans. This probably includes all of the published references 

 in which this species has been in any manner involved in revisions 

 or systematic notes. 



Pupa. In addition to the generic, divisional, and subdivisional 

 characters, the front and middle femora are armed each with one small 

 apical spine. Abdominal tergites 2 to 6, with long and prominent 

 pleural spines ; 1 is without distinct dorsal and lateral spines, but 2 to 

 6 have distinct dorsal and lateral ones, and all of them have a pair of 

 dorsal, and 2, 3, and 6 have a pair, and 4 and 5 have three lateral 

 spines each side of the dorsal ones; 7 has two dorsal spines, while 8 

 is smooth, and the pleural spines of 9 are long and prominent. Pupal 

 type labeled "Hopk. U. S. No. 623." 



In a number of individuals, the usual variation in the arrangement 

 and number of minor spines is found, and between the younger and 

 older examples there is a wide range of variation. 



The characters which seem to distinguish the pupa of this species 

 from that of D. monticolse are the coarser spines of the abdominal ter- 

 gites, the more densely granulate elytral pads, and the presence of but 

 one apical spine on the front and middle femora. 



Larva. In addition to the generic and divisional characters, the 

 front has the posterior angle subobtuse, and a stout prominent 

 rugose transverse elevation situated slightly behind the middle and 

 elevated and broad toward the sutures; clypeus with the base shining 

 and bearing a faint median elevation, and the apex broadly emargi- 

 nate; labrum less than half as long as broad, with the apex truncate; 

 sternellar lobes of the thoracic segments with indistinct foot calli. 

 Larval type labeled "Hopk. U. S. No. 755." 



There is some variation in the frontal elevation, but generally it 

 is situated behind the middle, and the posterior angle of the front is 

 more obtuse than in the preceding, which latter serves as the most 

 distinctive character separating the larva of this species from that of 

 D. monticolx. 



