484 The Ohio Naturalist. [Vol. XII, No. 5, 



" 9 . Length 6 mm. Head, thorax, base and tip of abdomen, 

 hind tarsi , base and lower middle of hind tibiae black ; four anterior 

 legs, posterior coxse, femora, and often tips of tibiae, tip of abdom- 

 inal segment 1, whole of 2 and .'3 and more or less of 4, rufous; 

 anterior orbits, mouth, tegulae, spot in front, line beneath, cunei- 

 form spots on mesonotum, scutellum, post-scutellum, and band 

 on posterior tibise white. 



cT — Differs only in having the face, scape beneath and a stripe 

 on pleura yellowish white. " 



As previously pointed out for Paragus hicolor (I. c.) the pres- 

 ence of the parasite is usually indicated at the time of pupation by 

 a failure of the pupariuni to inflate completely anteriorly and 

 dorsally, and retract on the ventral side, and also by its darker 

 color. The following are the average dimensions of 15 puparia 

 from which Bassus laetatorius had emerged: length 6 mm., height 

 2.25 mm., width 2.45 mm. Compared with the dimensions of 

 an equal number of unparasitized individuals as given below, it 

 will be seen that these are slightly less in all dimensions than the 

 nomial ones, with a little more difference in height than in length 

 or width. The difference in shape is more conspicuous than 

 these figures would indicate (See Fig. 56) and together with the 

 difference in color makes them rather easy to distinguish when 

 once the characteristics are learned. 



As suggested in the previous paper it ought to be easy to 

 accomplish a great deal of good by destro3-ing these parasitized 

 puparia before the parasite emerges. 



Pupariuni. 



Dimensions, average of 15: length 6.5 mm., height 2.5 mm., 

 width 2.6 mm. (Fig. 55). Pupation occurs within the indurated 

 larval skin after shortening and dorsal and lateral inflation espec- 

 ially at the anterior end. The head segments are retracted 

 ventrally so that segments 3 to 5 lie at the anterior pole and the tip 

 of the mouth-parts (tenninal in the larva) are about 0.5 cm., back 

 on the ventral side. The wrinkling of the skin, characteristic in 

 the larva is largely lost, due to the inflation. The vestiture 

 remains as in the larva, the segmental spines inconspicuous, but 

 the exposed parts of the wrinkles of the larva, densely covered 

 with very small, short, sharp, black spines. Sometimes this gives 

 a rather prominent transverse banding of black where the spines 

 are thickest. 



The posterior three segments are proportionately less inflated 

 than the middle ones. Shape from dorsal aspect ovate with the 

 last segment and its respiratory appendage projecting; very 

 slightly broadest in front of the middle, nicely rounded out in 

 front. From the side (Fig. 56) the anterior and dorsal inflation 



