1^2 Bulletin 2^^. 



The insect. — Within the brown mines or " blisters " on the leaves 

 may be found in summer from one to a dozen or more slender, whitish 

 larvae or "worms" (Fig. 24), varying from 2 to 7 or 8 millimeters in 

 length. When full grown, these larvae leave their mines and drop to the 

 ground. An inch or less below the surface of the soil they make a small, 

 thin, brown, papery cocoon to which particles of soil adhere. In 

 this cocoon the insect transforms through a tender, white pupa into the 

 small, black four-winged sawfly shown much enlarged in Fig. 28. In 

 this adult form the insect's body and head are shining black, and measure 

 about 3 millimeters in length ; when the wings are folded they extend 

 about a millimeter beyond the tip of the abdomen. When expanded, the 

 front wings measure about 8 millimeters across. The antennas and 

 femora are black and the tibiae and tarsi are light brownish with blackish 

 tinge, especially on the hind legs. The wings are quite dusky, considerably 

 more so than those of the elm species herein described. These two species 

 are easily distinguished by the position of the radial cross-vein (compare 

 Figs. 2/ and 28) as indicated in the table* for separating the species of 



* The following table for separating the species of the genus Kaliosysphiuga is 

 given by Konow, the European expert in this group of insects (Wien. Ent. Zeitung, 

 Vol. V, p. 269, 1886) : 



A. The radial cross-vein meets the second cubital cell just before the second cubital 

 cross-vein — i. uliiii Sundeval ("^ inter }ncdia Thorns). 



AA. The radial cross-vein lies behind the second cubital cross-vein. 



B. Third antennal joint twice as long as the fourth which is distinctly shorter 

 and thinner than the second — 2. puiuila Klg. 



BB. Third antennal joint only about a half longer than the fourth. 



C. Fourth antennal joint scarcely longer and a little thinner than the second, 

 the third a good half longer than the fourth; wings clear 



— 3. (/o/;;-;n'/ Tischb. 

 CC. Fourth antennal joint plainly longer and thicker than the second, the 

 third scarcely a half longer than the fourth ; wings very dark 



• — -4. mcJanopoda Cam. (= ;//.i,'ru-a;;j Thoms). 

 In a foot-note Konow says: " Dohrnii is very nearly related to mclanopoda and 

 only by a close observation of the characters given can it be separated ; more- 

 over it is always somewhat smaller, hardly 3 mm. long, while mclanopoda is some- 

 what longer." 



But in his description of inclauopoda and in his table for separating it from its 

 allies (Mon. of British Phyt. Hym., Vol. i, p. 292. 1882) Cameron states that the 

 third antennal joint is "more than double the length of the fourth" which would 

 put it in B instead of BB in Konow's table. Cameron mentions dohrnii only in a 

 foot-note (1. c. p. 291) saying that the description of it, so far as it goes, agrees with 

 citlicr puinila or mclanopoda. 



The sawflies I bred on European alder in 1891 were determined by Konow 

 (in 1896) as Kaliosysphinga dohrnii Tischbein (Stettin. Ent. Zeit., VIT. 1846. p. 80). 

 What is probably the same insect has been recorded several times in .Xmcrican 

 literature under the names mclanopoda Cameron (Can. Ent.. XXITI. p. 252) and 

 varipcs St. Fargeau (Can. Ent., XXV, 59 and 247; Fletcher's Rept. for 1892, p. 147). 



