4 PROCEEDINGS OF THE NATIONAL MUSEUM vor,. 70 



and a spur at the end. The claw joint of the tarsus is inflated anji 

 round with the claws appendiculate. 



LARVAE AND EGGS 



The only record of the larvae of this genus is that of E, M. 

 Craighead, who observed the larvae of Oedionychis gibhitarsa feed- 

 ing on the leaves of an unknown mint.^^ Mr. Craighead kindly sent 

 me his preserved specimens which Dr. A. G. Boving has described in 

 a separate publication, extracts of which are given below. Miss M. 

 E. Murtfeldt collected the pupa of this species at Baltimore many 

 yeai-s ago. She found the insect pupating in the ground in a little 

 earthern cell. H. O. Marsh collected eggs of Oedionychis interjec- 

 tionis on "tallow weed" {Euphorbia antisiphilitica?) in Texas. 

 They are elongate oblong, yellowish- white, and about 1 mm. in 

 length. Eggs of Oe. circumdata have been obtained by the writer 

 in the District of Columbia on Verbena urticaefolia. They are deep 

 orange, clavate, a little over 1 mm. in length, and are laid singly. 



MATURE LARVA 



(Described by Dr. A. G. Boving from specimens preserved in the 

 United States National Museum, marked : " Oedionychis gibbitarsa 

 Say on mint, Chambersburg, Pa., 20 July 1921. E. M. Craighead 

 Coll.") 



Length : About 10 mm. 



General form and color : Head strongly liypognathous with frous vertical 

 to the length of the body-trunk and seen from above almost hidden below 

 prothorax. Head capsule yellowish-brown with blackish-brown margins and 

 blackish-brown frontal carina ; labrum, mandibles, and chitinous parts of 

 antennae and ventral mouthparts yellowish brown, most of the head-setae 

 long, pointed, and brownish. Body subcylindrical, slightly flattened dorsally 

 and ventrally, somewhat tapering forward from metathorax and backward 

 from sixth abdominal segment to posterior part of eighth abdominal segment, 

 ninth and tenth small, together forming a walking apparatus; all segments 

 fleshy cream-whitish, with numerous soft protuberances carrying straw-yellow 

 setal cups and setae, no prothoracic shield and no shield dorsally on ninth 

 abdominal segment. Legs strong, of medium size and inserted widely apart 

 to the end of small, inverted T-shaped hypopleural chitinizations ; their color 

 light strav.-yellow with narrow darkeuings at the articulations; behind the 

 falciform claw with a membranous empodium shorter than the claw. Spirsicles 

 annular, pale straw-yellow, of middle size, all alike and lateral ; one in the 

 mesothoracic epipleurum and one immediately in front of the epipleural lobes 

 of the first eight abdominal segments. 



In common with most of the Halticinae larvae are the following structural 

 details of the head and mouthparts: Antennae two-jointed with basal mem- 

 brane large, enabling a complete retraction of the whole antenna ; proximal 

 antennal joint rather low and ringshaped with its top-membrane carrying 



>8E. M. Craighead, Ent. News, vol. 34, 1923, p. 119. 



