THE MYRIAI'ODA OF NORTH AMERICA. 



193 



Fig. 25. 



short hairs. Its border is rather deeply emarginate. The eyes- are in triangular patches, 

 and are quite prominent. The antenna) are rather long, filiform, pilose, and not at all 

 clavate. The first scutum has its transverse diameter scarcely equal to that of the head. 

 The anterior portion of its surface is smooth, the posterior strongly carinate. The surface 

 of the other scuta is divisible into three regions. The anterior of these is the broader, 

 and is strongly and closely keeled. The middle is the least in size, and is ornamented 

 with closely set small keels, entirely evanescent on the sides. The posterior is not at all 

 keeled, but is chased with curved, impressed lines. The keels at the position of the lateral 

 pores are much enlarged and thickened. On the surface above them there are about 

 seventeen keels to a segment. The last scutum is not at all pointed. The posterior por- 

 tion of the body is more or less pilose. The prcanal scale is broadly triangular. 



The female appendages appear to consist of a pair of somewhat conical flattened bodies, 

 with rounded summits, surmounted by a curved, rather thick, process, 

 which springs from the base. The male appendages (Fig. 25) consist of 

 two basal, irregular pieces, closely conjoined, and two processes arising 

 from each of them. The smaller of these is short, broad, rather straight 

 and acute at its end. The larger is composed of two parts. The shaft is 

 irregular and proximally curved at right angles to itself; from its distal 

 end proceeds at a sharp angle a curiously curved, somewhat spoon- 

 shaped, portion ; from near the point of junction of these arise a pair 

 of subcylindrical, nearly parallel, curved processes. One of these is frequently distally 

 bifid. 



Mr. Say, in his description of lulus lactarius, uses the following expression : " Eyes tri- 

 angular, granulated, deep black." In the Annals and Magazine Nat. Hist., vol. xiii, p. 

 266, Mr. Newport states that there were in the British Museum the original specimens 

 sent by Mr. Say to Dr. Leach as lulus lactarius, and that their eyes were arranged in 

 linear patches. He there indicates a new genus, under the name of Oambala, with lulus 

 lactarius, Say, for its type, and characterizes it by its linear eye-patches. On the other 

 hand, Mr. Brandt (Recueil) identifies certain specimens with triangular eye-patches in the 

 Museum at Berlin as I. lactarius of Say. M. Gervais, reviewing this, concludes that Mr. 

 Newport must have been mistaken, that his Cambala lactarius is not I. lactarius of Say. 

 I have seen very numerous specimens from different localities agreeing in all respects witli 

 Mr. Say's description, but never one with linear eye-patches. Again, I find that Mr. 

 Newport's description of Platops lineatus coincides with the specimens which I identify 

 as I. lactarius of Say. Now, can there be any doubt that, through the carelessness of 

 some one, the label had been transferred to the bottle of specimens which Mr. Newport 

 studied, and that really his P. lineatus was founded on the type specimens of Say's spe- 



voi<. xiii. — if) 



