14 RHYNCHOPHORA. 
Six specimens. Near P. sulphuriventris, but with a large conical tubercle on the 
third elytral interstice below the base, as in P. caprimulgus ; the spots on the upper 
surface more numerous and mostly smaller, those on the prothorax clustered into two 
transverse series across the middle of the disc. The elytral tubercles are more distant 
from the base than in P. spretus and conical in shape. The Guatemalan example is 
figured. 
6. Piazurus succivus. (Tab. I. fig. 24.) 
Piazurus succivus, Boh. in Schénh. Gen. Cure. iv. p. 670°. 
Piazurus notabilis, Boh. op. cit. viii. 2, p. 453°. 
Piazurus guttatus, Chevy. in litt. ’. 
Hab. Mexico! (ea coll. Sturm; Mus. Brit.), Misantla, Cerro de Plumas (Hoge), 
‘Toxpam, Juquila, Yolotepec, Oaxaca, Chiapas (Sallé), Omilteme and Amula in 
Guerrero (H. H. Smith), Villa Alta in Oaxaca (Sommer); GuatemaLa, Capetillo, 
Purula, San Gerénimo, Cerro Zunil (Champion). 
‘This species (the worn type of which I have seen) is so closely related to P. maculipes 
that it can only be separated therefrom by the sparser and more uniformly distributed 
vestiture of the under surface (in P. maculipes the sides of the abdomen are densely 
squamose and a broad space down the middle is almost bare), with coarser whitish 
scales intermixed. ‘The following forms may be noted :— 
a. The upper and under surfaces with intermixed scattered whitish scales. (Fig. 24.) 
Piazurus succivus and notabilis, Boh. 
Mexico (Vera Cruz, Guerrero, and Oaxaca) and Guatemala (Atlantic and Pacific slopes). 
(3. The under surface only with scattered intermixed whitish scales. 
Mexico (Guerrero and Oaxaca) and Guatemala (Atlantic and Pacific slopes). 
y. The vestiture of the upper surface darker, brown and black, the upper and under surfaces with scattered 
whitish scales ; the eyes less approximate, the median carina of the rostrum sometimes extending upwards 
between them. 
Cryptorhynchus bufo, Sturm, in litt. 
Mexico (Chiapas, Oaxaca). Four specimens. 
c. The vestiture of the upper surface paler, brown and cinereous, the black markings wanting, the under 
surface with scattered intermixed whitish scales; the eyes as in y. 
Mexico (Amula and Misantla). Three specimens. 
The forms a and 6 have been found in several localities with P. macu/ipes, of which 
they are little more than extreme varieties. It is, however, convenient to retain 
P. succivus as distinct, as it does not appear to extend south of Guatemala. Some 
specimens have the head carinate between the eyes and the latter well separated. The 
smaller ones have the prothorax strongly transverse, and the posterior femora not 
nearly reaching the apex of the abdomen. ‘The size is very variable, one example 
before me measuring 7$ mm. only in length, while our largest reaches 13? mm. Two 
from Purula are infested with Acari. 
