CERAMBYCID.E 359 



Saperda tridentata ssp. trifasciata nov. Similar to tridentata but rather 

 more elongate, similarly ornamented with orange lines, the distance 

 between the middle oblique fascia and the anterior usually much greater 

 than that between the former and the posterior fascia; minute cinereous 

 vestiture coarser and denser, frequently concealing the punctures; legs 

 testaceous almost throughout, the tarsi black, the cinereous vestiture not 

 so dense as in tridentata; antennae fusco-testaceous. Length (cf 9 ) 8.8- 

 14.0 mm.; width 2.4 -4.3 mm. Indiana. Fourteen examples. 



The testaceous legs and partially rufescent under surface will 

 readily distinguish this subspecies from tridentata, where the legs, 

 under surface and antennae are deep black, the abdomen rufescent 

 laterally. In addition, the three elytral fasciae in tridentata are 

 subequally spaced longitudinally. The antennal scape is longer and 

 paler than in tridentata and is less abruptly narrowed at base. The 

 name dubiosa Hald., applies to certain small semi-denuded males 

 of tridentata, as shown by the black antennas; this latter character 

 will distinguish it at once from the subspecies trifasciata. 



The following is allied to concolor Lee. : 



Saperda mecasoides n. sp. Form, coloration and vestiture nearly as in 

 concolor, but rather more slender and with shorter prothorax, on which 

 the lateral whiter vitta is scarcely traceable; the antennae ( 9 ) are shorter, 

 not quite three-fourths as long as the body, the outer joints much shorter 

 than in concolor ( 9 ), the tenth scarcely three times as long as wide; erect 

 hairs at the sides of the prothorax very short, scarcely evident. Length 

 (9 ) 10.0 mm.; width 2.8 mm. New York (near the city). 



Differs from concolor principally in the shorter antennae and 

 virtual absence of long erect bristling hairs at the sides of the pro- 

 thorax, these being replaced by shorter hairs; the hairs along the 

 under surface of the antennas are extremely few in number. It is 

 probable that the food habits of these two forms are different. 



Saperda vestita Say, is subject to a certain amount of local varia- 

 tion. The Canadian representatives, for example, are usually shorter 

 and relatively broader than those occurring from New York to 

 Texas, and Prof. Wickham obtained a form on the southern shores 

 of Lake Superior, which is relatively more slender and with more 

 fuscous cinereous vestiture. From Illinois, I have a single male 

 having the entire antennae testaceous. These differences are recog- 

 nizable in series but are too slight for record in nomenclature. 



Lateralis Fabr. is usually very uniform in ornamentation, but in 

 one example of my series there is an isolated oblique medial dash 

 of orange on each elytron. 



