23,6 Schultze: Pachyrrhynchus 539 



oblong scale spot in the middle and another spot near apex. 

 Penis structure, Plate 3, fig. 29. 



Male, length, 8.5 to 12.5 millimeters (without rostrum) ; 

 width, 3.5 to 5.5. Female, length, 8.8 to 12.5 millimeters (with- 

 out rostrum) ; width, 4.2 to 6.5. 



Luzon, Benguet Subprovince, Bued River Valley; Baguio; 

 Mount Santo Tomas; Mount Mirador; Trinidad; Mountain Trail, 

 Baguio to Bontoc : Kalinga Subprovince, Lubuagan : Ilocos Norte 

 Province, Bangui, Burgos, Mount Nagapatan: Cagayan Prov- 

 ince, Sanchez Mira (Schultze) . Abundant on Jatropha curcas 

 Linn. 



This species has a relatively wide distribution but only in the 

 mountainous parts of northern Luzon. Very probably some 

 local forms will be found in the small islands north of Luzon. 

 I know of no other species of Pachyrrhynchus which exhibits 

 such a great variety of forms as P. orbifer in reference to the 

 scale designs or markings and the coloration of same. Water- 

 house 40 recognized the very great variability of this species and 

 its close relation to P. moniliferus Germ. In this connection 

 attention is called to the following well-founded remarks 41 by 

 this author concerning P. orbifer: 



This species I suspect, as well as that described under the name P. chlo- 

 rolineatus, is but a local variety of P. moniliferus. 



Pachyrrhynchus orbifer Waterh. replaces P. moniliferus Germ, 

 in the northern half of Luzon in the mountainous regions. The 

 specific demarcation characters between the two species, as 

 such, are in some forms extremely inconspicuous and slight. 

 But for the sake of easier determination and better recognition 

 of the many local forms and variations of both species it is 

 strongly advisable to retain for P. orbifer the specific status. 

 My conclusions in this respect I base on the examination of 

 several thousand specimens of both of these species. 



In several instances a certain variation is found only in a 

 relatively small locality, but in other instances a rather large 

 series of intermediate forms among the more strongly pro- 

 nounced variations were found together in some other localities. 

 It is very easy to select hundreds of variations from a large 

 amount of material of P. orbifer, many of which, if seen in 

 single specimens, will convey strongly the idea that they rep- 



