1863.] 
191 
lists call the 1st abdominal joint is the'metathoracic postscutellum, and 
their abdominal joints 2 —10 the true abdominal joints 1—^9 3 although, 
to prevent confusion, I have adopted the customary phraseology in my 
descriptions. In Ephemerina, on the contrary^ the abdomen is usually 
described as 9-jointed both in larva and imago. (Westw. Introd. II, pp. 
26 and 31.) 
The same mistake has been made by authors in certain entire Orders, 
e. g., Coleoptera, and in certain families of other Orders, and has been 
corrected by IV'estwood in Tenthredinidae and Tipulidae. I had origi¬ 
nally intended to accompany this Paper by a general Enquiry, illus¬ 
trated by drawings, into the Homologies of the Segmental Subseg¬ 
ments, for which I had prepared copious materials; but the subject 
has extended to so much greater length than I had anticipated, that I 
reserve this Enquiry for a future occasion. 
JS^ote 7, p. 169. This is an error, for which nobody but myself is 
to blame. In English “large” refers both to length and hreadth^ and 
it is length only which is here spoken of Singularly enough, in French 
“ large” refers to breadth only and in Latin “largus” refers neither to 
length nor to breadth, meaning simply “abundant.” 
Note 8, p. 170 . B. ARiDA Say, Walsh. I have noticed this vari¬ 
ation in the coloring of the anterior legs in my description. The ante¬ 
rior tibia % 9 varies , from pale greenish, slightly obfuscated at base 
and tip, to dark fuscous or brown-black, immaculate. 
Note 9, p. 170 . B. SICCA Walsh. A careful examination of 9 S 
sicca satisfies me that the last dorsal joint of the abdomen is, like the 
rest, piceous^ and not ferruginous, as I have erroneously described it. 
It is the same in color as joints I—8, in 9 also. 
Note 10, p. 170. I have described the first tarsal joint of the ante¬ 
rior leg % 9 sicca as “ conspicuously pale, except at the incisures,” by 
which last term I intended to comprehend the incisure between the 
1st basal joint and the tibia. The incisures, therefore, as the ground 
color is said to be “piceous,” are of course supposed to be piceous. I 
have also described the tip of the anterior tibiae S 9 as black. It 
would have been more correct to say that both the tip of the tibia and 
the base of the 1st tarsal joint are black or fuscous. The tip of joint 
1 and the whole of joints 2—5 of the anterior tarsi are, in reality, 
rather fuscous than piceous, but in a single S specimen joints 2 and 3 
