257 



HAEEIS TO ZIMMERMAN. 



Cambridge, Nov. 10, 1837. 



You have asked me for the characters of Mr. Say's new 

 o-enus Amhhjcheila, specimens of which are among the insects 

 brouo-ht bv Mr. Townsend from Ore2;on and presented by him 

 to the Academy of Natural Sciences of Philadelphia, and now in 

 mv keeping. Mr. Say established the genus in a paper printed 

 at (New) Harmony, Indiana, in March, 1830, and reprinted 

 in the Transactions of the Philosophical Society of Philadelphia, 

 N. S., Vol. IV, p. 409 (4to, Philadelphia, 1834). The insect 

 upon which ]\Ir. Say formed this genus, he described in the 

 Journal of the Academy of Natural Sciences, Philadelphia, 

 Vol. Ill, p. 139, by the name of Mantieora cylindriformis ; 

 he obtained it at the foot of the Rocky Mountains, in 

 the expedition under Major Long. As soon as I saw Mr. 

 Townsend's insects, I thought two of the species must belong 

 to Mr. Say's new genus ; but to make the matter certain, since 

 the receipt of your letter, I have softened them in spirit, and 

 have examined their mouths with great care. [Dr. LeConte 

 states that one of these species is Omus Dejeanii, the other 

 0. Audouinii.'] The following are the characters in detail 

 which the insects present : — 



Tarsi five-jointed ; legs fitted for running ; anterior tibias not 

 notched; mouth carnivorous; palpi six; labials and external 

 maxillaries four-jointed ; maxillge with an articulated hook at 

 the end. 



Genus Amblyclieila Say. 



Head subquadrate, not contracted at base ; eyes small, hemi- 

 spherical. 



Antennce rather slender, filiform, with obconico-cylindrical 

 joints ; first joint thickest, about as long as the third ; second 

 joint rather more than half the length of the third ; last joint 

 (eleventh) cylindrical, obtuse at tip. 



Upper lip transverse, very short, anterior edge emarginated, 



OCCAS. PAPERS D. S. N. II. — I. 17 



