OF WASHINGTON, VOLUME XIX, 1917 149 



finely serrated on the edges. In general this spiracle resembles a "ram's 

 horn." The wing-pads reach to about the middle of the second abdominal 

 segment and the leg-sheaths slightly beyond the pads. Near the base of 

 each wing-pad is a rugose tubercle, terminating into a chitinous, pointed 

 tooth. 



Abdomen. Along the basal edge of the first segment is a row of large 

 tooth-like, dark brown spines with the points turning backward. Each 

 of the end spines are much smaller than the others. On the sides of the 

 first segment, close to the apical edge, is a row of spines, reaching from the 

 lateral edge of the dorsum to the wing-pads. All the other segments, ex- 

 cept the last, have a transverse row of prominent spines near the apex 

 encircling the segment, the spines on the dorsum are the larger. The last 

 segment has two pairs of very small spines on the dorsum, near the base. 

 On each side are three larger spines near the middle and transversely across 

 the middle of the venter are four spines. This segment terminates into two 

 very large horn-like spines. All the spines on the pupa are shiny, heavily 

 chitinized and quite dark on the apical half, the basal portion is rugose and 

 of the same color as the pupal skin. 



On the side of all the segments, except the last, is a ridge which is broad 

 and slightly rounded, extending the longitudinal length of each segment. 

 Above and slightly in front of the center of each ridge, is a spiracle like the 

 humeral one but lighter in color and opening on the cephalic side. 



The adult emerges from the pupa through a longitudinal, dorsal slit in 

 the thorax and the bursting of the sutures around the head. 



Dasyllis thoracica Fabr. 



Syst. Anil., p. 158. 



This species is predaceous in the larval stage and a secondary 

 wood-borer, in moist dead, Tulip stumps. It closely resembles a 

 Coleopterous larva and is easily overlooked because it closely 

 resembles the wood fibre, in which it lives. The larvae were 

 collected at Falls Church, Va., April 10, 1914, by Mr. S. A. Rohwcr 

 and the writer. 



They pupated April 21, 1914 and emerged May 11, 1914. 

 Under natural conditions, the larva pupates in the gallery, and 

 the pupa is fairly active. 



Larva (plate XVIII, jig. 1). 



Larva. Opaque, white, elongate and cylindrical. The entire larva 

 longitudinally striate. The greatest width of the larva is across the 

 second segment; other segments nearly parallel. The larva is 27 nun. 

 long and 5.5 mm. wide across the second segment , while t lie ot her segments 

 are nearly 5 mm. wide. 



The head is very heavily chitinized and black with the liasal corners 

 reddish. From a dorsal view the head is divided into three parts. The 



