SYSTENA. 325 



6. Systena contigua. (Tab. xix. fig. 25.) 



Testaceous below ; antennae and apices of the posterior femora stained with piceous ; above testaceous ; thorax 

 with a black spot on each side ; elytra with a triangular spot near the scutellum, another below the 

 middle, and connected with a stripe at the lateral margin, black. 



Yar. a. Thorax unspotted. 



Yar. b. Below black, the elytral spots more elongate and widened, forming sometimes a transverse band. 



Length 2|-3 lines. 



Hob. Mexico, Tuxtla, Juquila, Guanajuato {coll. Salle), Jalapa {Edge); Guatemala, 

 Aceytuno {Salvin), Duefias {Champion). 



Although not differing in any structural details from S. variabilis and S. nigropla- 

 giata, the difference in the elytral pattern induces me to separate the present insect. 

 In all the specimens under my observation there is a narrow sublateral black stripe 

 connected with the posterior spot of the elytra, which latter assumes often the shape of 

 a narrow transverse band, and is situated immediately below the middle ; the underside 

 of all the specimens, with the exception of one from Aceytuno (var. b), is testaceous ; 

 the elytral lateral stripe commences at the shoulder and extends to the second spot. 

 The antennge in S. contigua are also longer than in the allied species, and extend to 

 two thirds the length of the elytra. 



7. Systena undulata. (Tab. XIX. fig. 22.) 



Testaceous; thorax and elytra finely punctured, the latter with a longitudinal sublateral stripe, the suture, 



a triangular spot at the base, and a transverse band below the middle black. 

 Var. Thorax with a black spot on each side ; tibiae obscure fuscous. 

 Length 2|-3 lines. 



Hab. Mexico, Cordova {Hoge), Guanajuato {coll. Salle). 



In this species, which may after all be but a variety of one of the preceding, the 

 pattern of the elytra is again different, although allied to S. contigua; the lateral stripe, 

 instead of being connected with the posterior transverse band, as in that species, extends 

 here below the middle and nearly to the apex ; the posterior band is placed further 

 backwards than in S. contigua, and, lastly, the sutural margin is always black. As 

 these markings are constant in the four specimens before me, I am inclined to consider 

 the species a distinct one, principally on account of the position of the elytral black 

 transverse band. 



8. Systena apicicornis. (Tab. XX. fig. l.) 



Flavous; breast, tibia), head, and antennas black; the last four joints of the latter flavous; thorax fulvous, 

 impunctate ; elytra minutely punctured, black, subopaque, a spot at the base, the apex, and a transverse 

 band at the middle flavous. 



Length 2i lines. .-,.,-. ■, j. i • -, 



Head impunctate, black, shining, transversely grooved between the eyes, the carina distinct and acutely raised ; 



antennas half the length of the body, slender, the third and following joints of nearly equal length, black, 



the four terminal joints fulvous ; thorax transversely subquadrate, the sides rather strongly rounded ; the 



angles acute, the posterior ones obliquely cut, the surface pale fulvous, impunctate, the basilar groove 



