246 MAINS AGRICULTURAL EXPERIMENT STATION. 1916. 



black and across behind the mouth. Pubescence behind the eyes whitish 

 below, orange above. 



Spots on the second abdominal segment in most specimens quad- 

 rangular rather than triangular. All the yellow bands distinctly sepa- 

 rated from the side margins. The bands on the third and fourth 

 abdominal segments, in both male and female, on the middle line, with 

 a small anteriorly and posteriorly directed pointed projection, not shown 

 in Verrall's figure 296. 



The anterior femora are black on the basal fourth, the hind femora 

 on a little more than the basal half. 



In the females the lunate, black spots above the base of the antennae 

 are rather prominent and, in one specimen, almost continuous with the 

 widened black extension from the vertex. The black stripe over the 

 facial knob is present but the stripes across the cheeks not developed^ 

 the latter yellow to the jowls. 



Hind femora entirely yellow the anterior ones black on about the 

 basal sixth. The third joint of the antennae in both sexes only a little 

 longer than deep after the end of the second joint. 



DIDEA FASCIATA Macq. var. FUSCIPES Loew. 



(See also 30, p. 337, 34, p. 90 and 35, p. 58.) 

 This species which in Ohio I have found breeding only on 

 Longistigma caryae infesting sycamore and basswood, was 

 found among the Willow Grove Plant-louse (Pterocomma 

 fl.occulosa) on the University of Maine campus the last of July 

 and first of August, at which time most of the larvse were full 

 grown. Pupation took place about August 10. Adults were 

 captured July 15 about infested twigs of green apple aphis 

 (Aphis pomi). 



The following descriptions are abbreviated from my previous 

 publications on this species (30; 34, p. 90; 35, p. 58). 



Egg. (Fig. 29-5). Of about the usual shape; broadest about the 

 middle. Length 1.3 to 1.7 mm., diameter 0.4 to O.6 mm. Color chalk 

 white. The chorion is sculptured in a characteristic manner. The pro- 

 jecting bodies are close together, not highly elevated, each one two to 

 four times as long as broad. There are 55 to 60 of these bodies length- 

 wise of the egg and 80 to 100 around 1 it at the middle. The egg of 

 Didea differs from all the others I have .seen in that the projecting 

 bodies are not smooth on the top but each one has a small number 

 (6-10) of more or less angular, irregular-shaped, pit-like depressions 

 hollowed out of it. These are so arranged as to leave between them 

 an elevated part of the body with more or less parallel sides. The whole 

 effect is to give the arm-like network appearance over the elevated body 

 somewhat like that between these bodies, without the outlines of the 

 bodies being obscured. The arms between these bodies are irregular, 



