266 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



0.31mm.; vi, 0.154 mm. Total length, 1.7 mm. Rostrum, iii, 

 0,27 mm. ; iv, 0.19 mm. ; v, 0.1 mm. Total length, 2 mm. Length 

 of hind tibia, 2.5 mm. ; hind tarsus, 0.14 and 0.4 mm. 



Alate viviparous female : General color, head and thorax shining 

 black, abdomen as in the apterous forms. Cornicles black, with a 

 large white spot at the base, and which does not become conspic- 

 uous until the specimens are placed in alcohol. Abdomen 

 maculated with brown. 



Antennae reaching to the base of the wings and the third seg- 

 ment with from eight to eleven irregular sensoria ; fourth segment 

 with one or two large ones near the distal end; sixth antennal 

 segment short and thumb-like. Antennae legs and body of both 

 apterous and alate forms with short spine-like hairs. Those on 

 the Jegs are distinctly pointed toward the tip of the segments. 



Measurements : Length of body, 4.58 mm. Length of antennal 

 segments, iii, 0.69 mm. ; iv, 0.27 mm. ; v, 0.35 mm. ; vi, 0.135 mm. 

 Total length, 1.5 mm. Rostrum, iii, 0.27 mm.; iv, 0.20 mm.; v, 

 0.1 mm. Total length, 1.9 mm. Length of hind tibia, 3.22 mm.; 

 tarsus, 0.135 mm. and 0.35 mm. 



Food plant : Larix laricina. 

 D. strobi (Fitch). Lachnus strobi Fitch. (Eggs, PI. xix, 10.) 



Homop. N. Y. St. Cab., 69, 1851. 



Apterous viviparous female: General color shining metallic 

 black with a series of white pruinose spots on the dorsum. The 

 typical specimens have a median dorsal line along the abdomen 

 extending from the prothorax to the cauda. Usually there are 

 two white spots on the thorax, and four on the abdomen, one in 

 front and one behind each cornicle. The legs are black and 

 strongly curved. The cornicles are jet black. Antennae with the 

 third, fourth and fifth segments light colored at the base and black 

 at the tips ; the sixth segment black. 



Antennae long and slender, the sixth segment long and finger- 

 Hke. Third antennal segment much longer than the fourth and 

 fifth segments together; fourth and fifth segments without sen- 

 soria and the fifth with two. Rostrum extending slightly beyond 

 the hind coxae, cornicles with a wide sloping base. Cauda broadly 

 acute with a rounded tip. Antennae body and legs with long 

 drooping hairs. 



Measurements : Length of body, 3 to 5 mm. Length of anten- 

 nal segments, iii, 0.4 mm. ; iv, 0.15 mm. ; v, 0.2 mm. ; vi, 0.18 mm. 

 Total length, 1.09 mm. Rostrum, iii, 0.21mm.; iv, 0.187 mm.; 

 v, 0.063 mm. Total length, 1.9 mm. Length of hind tibia, 

 2.7 mm. ; hind tarsus, 0.12 and 0.29 mm. 



Alate viviparous female : General color, black, sometimes tinged 

 with brown. It is conspicuous because of the white line down the 

 center of the body and the white spots on the abdomen similar to 

 the apterous form. The antennae are long and slender with the 



