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JOURNAL OF ECONOMIC ENTOMOLOGY 



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were transferred to cages containing small potted white pine plants 

 and eggs were soon obtained. 



On April 21, I wrote about this to Dr. MacGillivray, who at once 

 examined his cages and found some adults. He stated that he did not 

 know the species but that it belonged to the genus Diprion formerly 

 known as Lophyrus. The species are badly confused and he recom- 

 mended that we send material to Mr. S. A. Rohwer, of Washington, 

 D. C, who is at work on the group and has examined many of the 

 types in the British Museum. Consequently some adults of both 

 sexes, an inflated larva and a pupa case were submitted on May 6, to 

 Mr. Rohwer who wrote as follows : 



^'I have determined this species, tentatively, as Diprion simile Har- 

 tig. The adults agree more closely with those in the collection under 

 the name pini but the larvae answer exactly the description of simile, 

 and as these two species are very closely allied and easily confused in 

 the adults I have made the determination from the larvae rather than 

 from the adults. 



''This species is one of the most injurious sawflies on European 

 conifers and has been associated in practically all of the depredations 

 caused by pini, and is recorded in the literature in a number of cases 

 under the name of pini. You are no doubt familiar with the economic 

 importance of Diprion pini in Europe. It is highly important that 

 immediate measures be taken to combat this injurious insect as it has 

 a large number of host trees and would no doubt adapt itself readily to 

 the conditions in America, where, if it were thoroughly established 

 without its parasites, it would do a great deal of damage." 



The appearance of this insect in all its stages is shown on plate 19 

 and brieflj" ma}- be described as follows: 



Egg. — The eggs are laid end to end in slits made along one of the ridges at the 

 edge of the needle. The eggs are pale blue in color, smooth and slightly shining. 

 The sides are parallel with the ends rounded. Length, 1.25 mm., thickness, .33 mm. 

 In the material examined the newly laid eggs were shghtly separated in the slits. 

 The eggs before hatching increase in size, becoming crowded in the shts so that the 

 ends are flattened like peas in a pod. 



Larva.— Length, 25 mm. (1 inch) to 28 mm. (l^'s inches).. Thickness, 4 mm. 

 (5/32 inch). Head black, body greenish yellow with a mid-dorsal double stripe of 

 brovvTi extending the entire length. On either side of the dorsal stripe is a yellow 

 stripe broken with transverse markings of brown. The remainder of sides dark brown 

 with many irregular yellow or whitish spots. Ventral surface pale yellow or white. 

 Pro-legs yellow with a transverse black mark at base, true legs marked with black 

 and yellow. 



Cocoon. — 9 mm. long (about Vs inch), thickness about 5 mm., oval in shape, 

 tough leathery and fairh' smooth. Color, sepia. 



Male. — ^^\"ing-spread, 14 mm. (Vie inch). Length, 7 mm. Large pectinate ' 

 antennae. Head and pronotum coarsely punctured. Head, antennae and body, 



