40 



EESULTS FROM GIPSY MOTH PARASITE LABORATORY. 



maxilla', but the minute character of which makes it impossible to 

 determine their nature without considerable uncertainty. Head 

 heavily armored with two powerful hooks or horns on the anterior 

 margin, projecting laterally, about the size of the 

 mandibles; above are seen two rather strong hooks 

 at about the middle, both curved backward at 

 tips; just back of hooks on dorsal portion of liead 

 are several semitransparent round spots, which 

 probably bear small bristles, and may be sensory 

 in function. 



Body segments as follows: First segment (ex- 

 cluding head) provided dorsally with two very 

 minute semitransparent round spots, with dark 

 spot in center, which is probably a minute spine, 

 but which is rendered practically invisible by the 

 clearing action of the balsam; 

 ventrally the same segment is 

 provided with two other similar 

 spots, but which bear very dis- 

 tinct curved spines, one in the 

 center of each. The heavy chit- 

 inous ring does not join beneath 

 the body, each side ending in- 

 stead with the ventro-posterior 

 margin, which is serrated or 

 fringed with long teeth, about 



Fig. '2i.—Pcrilampus hyali- F , . 



nus: pianidium, ventral 30 m number, bccommg grad- 

 view. Magnified about ^,.jiy shorter as they ai^proach 



350 diameters. (Original.) •; • i. i i 



the lateral margm of the pian- 

 idium. Between these fringed margms, situated 

 in the center of the ventral portion of the segment, 

 are three peculiar appendages which apparently 

 function as ambulatory organs; these are some- 

 what flattened pyriform, with the broad end 

 heavily notched somewhat at one side and attachetl 

 at small end; at the bases of these are several 

 small irregular appendages. The second seg- 

 ment is provided with the dorsal, backwardly 

 curved spines, much closer together than on 

 precedmg segment and rather larger, and two 

 ventral smaller spines; the teeth are slightly 

 smaller. Between the serrate margins, as in 

 preceding segment, are several hooks or motor appendages, but of 

 quite a different type, these 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 



Fig. 'Ib.^l'crilampus hyali- 

 nue: rianidiiun, dor.sal 

 view. Magnified about 

 350 diameters. (Origi- 

 nal.) 



