1034 



FAMILY LII. — CERAMBYCIDiE. 



Fig. 439. Female. X 1\. (After Hopkins in Circ. 

 No. 83 ; Bur. Ent. U. S. Dept . Agr.) 



1911 (6171). Cyllene kobinle Forst., Nov. Sp. Ins., 1771, 43. 



Resembles p i c t u s so closely that 

 only an expert can tell them apart. The 

 characters given in the key are those 

 usually relied upon. The elytra are less 

 tapering and more broadly rounded at 

 apex, thus giving it a more robust appear- 

 ance, and the hind femora and antennae of 

 male are distinctly shorter than in pictus. 

 Length 14-20 mm. (Fig. 439.) 



Throughout the State : common. 

 August 21 -October 9. Occurs 

 abundantly in autumn on golden- 

 rocl and about the trees of the 

 black locust (Robinia). The wood 

 of this tree is often injured by the 

 larva, which is known as the "locust 

 borer. ' ' 



1912 (6172). Cyllene decoeus Oliv.. 



Ent., IV, 1795, 63. 

 Elongate, robust. Head black ; cly- 

 peus and a narrow transverse band be- 

 hind the eyes, yellow ;. thorax yellow 

 with three short and narrow, black 

 crossbars ; elytra black, the basal third, a band behind the middle and the 

 tips yellow ; under surface yellow. Length 14-20 mm. 



Knox County; rare, October 11. One specimen from near 

 the border of the tamarack swamp. A southern species, which in 

 Indiana reaches its most northern and eastern range. Our form is 

 the var. charus Say described from Posey County, Say's specimen 

 being taken "near the end of August." 



XXVIII. Plagionotus Muls. 1812. (Gr., "oblique + back." ) 

 This genus contains only a single large species, distinguished 



from its allies by the heavier compressed antenna?. 



1913 (6173). Plagionotus speciosus Say, Amer. Entoin.. 

 pi 53 ; ibid. I, US. 

 Elongate, robust. Black ; densely clothed with yel- 

 low pubescence, this covering the greater part of head 



and forming two short oblique bands on each side of 



thorax and five on elytra, arranged as follows: one 



forming an arch diverging from scutellum, behind this 



a second W-shaped band; a third nearly transverse 



one across the middle ; a fourth curved each side from 



the suture obliquely backward and separated narrowly 



from the fifth and broadest upon the apex. Length 



23-25 mm. (Fig. 440.) 



III. 1S2S. 118. 



Fig. 440. Natural sue 

 (After Saunders. ; 



