256 MAINE AGRICULTURAL EXPERIMENT STATION. I914. 



was measured September 1908 and gave III, .856; IV, .579, 

 V, .585; VI*, .143; VII*, 1.356 mm. Length of body 2.2 mm. 

 The measurements are approximate, being made with camera 

 lucida. In September, 1908, Professor Gillette sent me 7C7X 

 from Fort Collins, Col, on cultivated Crataegus, some half 

 grown apterous specimens which I identified as crataegi. He 

 says in his letter 'apterous are not yellowish green but light 

 yellow tinged with green, each louse has upon its dorsum 

 four conspicuous green spots arranged in form of a quadran- 

 gle — two near the bases of the cornicles and two near the 

 metathorax. The antennae are not black on joints 3, 4 and 5' 

 but these joints are annulated with black at the distal ends,' 

 September 28, 1908, Professor Gillette sent me alcoholic winged 

 material which I mounted as 722X. Evidently all are males. 

 One anten-na measured III .599, IV .514, V .499, VI* .114, 

 VII* .914 mm." 



"September 21, 1908, Mr. Davis wrote he had crataegi at Chi- 

 cago saying 'it agrees with description except in antennal col- 

 oration, the. antennae being entirelly pale except at joints 

 3-J-4, 4+5 and 5+6. Also legs are brownish'." 



Aphis avenae (Fab.) Oat Aphis. 



(Figure 90, G-I. Figure 96, D.) 



A collection of avenae (33-12) made from Crataegus at Orono 

 June 14,, 1912, is interesting enough to record. Alate viviparous 

 females and pupae were taken. The latter were green with darker 

 green longitudinal median and sub-lateral lines between which 

 ran a row of whitish spots. There were no rusty or orange c61- 

 ored markings near the cornicles. On date of collection 12 of 

 the migrants were caged in the laboratory on young oats. Of 

 the two of these which settled on the grain and produced pro- 

 geny, one remained alive and active until June 25. The nymphs 

 were very pale green with rusty yellowish places at base of 

 cornicles and connecting them. Two of these had reached ma- 

 turity and were producing young on June 26. These were both 

 apterous and the rusty orange curve connecting the cornicles 

 was conspicuous in the adult stage. On June 29 one pupa was 



That is basal VI and spur of VI. 



