322 WILLIAM R. THOMPSON 



Bien qu'il ait pu suivre dans le laboratoire le cycle évolutif 

 de Perilampns pendant la vie larvaire et nymphale, M. Smith 

 n'a pas réussi — pas plus que VVHEELERdans son éAnAo, à' Orasema 

 — à observer la ponte. Mais, à l'inverse de Wheeler — qui suppo- 

 sait que la femelle de l'Hvménoptère dépose directement ses œufs 



tlieir nature wiUioul considerahie uncerlaiiity. Ilead hcavily armovired willi two 

 powerful hooks or horns on Ihe atilerior niarn;in. pioji^clinR laterally, about the 

 size of llie mandibles ; ahove are seen two rallier' sirnnfï hooks at. about the 

 niiddle, both curved backwnrd at tips : ju«t back of hooks on dorsal portion of 

 head are several semitransparenl round spots, wbich probably bcar sniall brisl- 

 les and may be sensory in function. 



Body segments as follows : First segment (including head) provided dorsally 

 with two very minute semitransparenl round spots, with dark spot in cenfer, 

 which is probably a minute «pine, but wh'ch is rendered praelically invisible by 

 the clearing nclion of the balsam, ventrally the same segment is provided with 

 two other similar spots but wliieli bear very distinct curved spines, one in the 

 center of each . The henvy chitinous ring does not join bcneath the body, each 

 side ending instead wilh Ihe ventro-posierior margin, whieh is serr.ited or frin- 

 ■ged with long teeth, about 30 in number, be<'oming t-radually shorter as they 

 approach the latéral margin of the planidium Between thèse rini>ed margins, 

 situated in the center of the ventral portion of the segment, are Ihree peculiar 

 appendages which apparently function as ambulalory organs : thèse are some- 

 what flattened pyriform, with the broad end heavily notched somewhat at 

 one side and attached at small end , at the bases of th^se are several small 

 irregular apendages. The second segment is provided wilh the dorsal backwardly 

 curved spines, much doser fogether thnn on preceding segment and rather 

 larger, and two ventral smaller spines; the leeth are sliiihtly smaller. Bet- 

 ween the serrate margins, as in preceding segment, are several hooks or molor 

 appendages, but of quite a différent type, thèse latter being simply plain hooks 

 projecting backward, there being two transverse rows, about 10 in first row and 

 about 16 in second. Between first and second segments on the ventral side, 

 situated in the elastic inlegument Connecting the chitinized plates, are two 

 sligmala, apparently the only spiracular openings in Ihe wliolé trachéal system. 

 Third segment similar lo preceding the Iwo dorsal spines being considerably 

 farther apart ; the ends nf the chitinous plate, however. are of quile a dilferent 

 type : instead of ending in a serrate margin the inner margin is smooth, but the 

 posterior corne- t rminaies in a loniï lapering projection consideraby longer 

 than the width of the chitinous s'derites : lalera l oi the long tapering projection 

 referred to above. are two or three much smaller ones. also siluated on the 

 apical margins of tlie segment ; between the ends of the chitinous plates as in 

 preceding segments are several hook like motor appendages, smaller and fewer 

 in number, however, than in the second segment ; an additional séries nf hooks 

 which is not provided in preceding segments is situated just laterad of thèse. The 

 fourth segment seems to hâve no dorsal spines ; there are two ventral ones, 

 however, situated at the c.\treme outer margin of the ring ; the chitinous plate 

 terminâtes as in the third segment ; motor appendages as in the third segment 

 but fewer in number. The fifth segment dilfers from the fourth apparently only 

 in the possession of a pair of dorsal spines and in the smaller muaber of ventral 

 motor appendages. l'he sixth segment does not bave the dorsal spines but in 

 other respects ir. similar to the fifth ; the sevenlh segmimt possesses the doi'sa] 

 spines : the eighih does not, nor does the tenth, eleventh, or twclfth ; thèse latter 

 however, are similar in other respects, excepting thnl Ihcy become gradually less 

 in size. The last segment is provided with an unjointed stylet on each side atta- 

 ched at about the middle of the segment, this stylet about twice the length of the 

 segment itseif » 



