LACHNUS AGILIS. 47 



were described as doing considerable injury to the 

 cypresses of the neighbourhood, towards the end of 

 the year 1879. 



The insect has some resemblance in form to LacJmus 

 juniperi, but it certainly is quite distinct from it, and 

 the species has not been described before. 



Note. — There has been an unavoidable error in the 

 order of the plates, occasioned by the fact that the 

 early plate was completed before the new Aphis was 

 described. Lachnus cupressi should come after Lach- 

 nus juniperi, and before Stomaphis qiiercus. 



Lachnus agilis, Kalt. Plate XOVI, figs. 3 — 5. 

 Aphis agilis. Walk. 



Apterous viviparous female. 



Inch. Millimetres. 



Size of body 0*070 x 0-025 1770 X 0-620. 



Length of antennae 0-035 0-880. 



Cornicles wartlike. 



Fusiform, pilose, green, speckled with numerous 

 minute reddish dots. Vertex and cauda tufted with 

 bristles. Head broad. Eyes brown. Antenna3 green. 

 Legs green and very long. Tarsi distinctly two- 

 jointed. Cornicles very small, almost invisible. Kos- 

 trum reaches to the first abdominal ring. Taken in 

 June when they contained many embryos. 



Pupa. 



Linear, bright green. Head, eyes, antennga, wing- 

 cases, and legs smoky black. Rostrum reaches to 

 the third coxae only. These insects are very nimble 

 in their movements, and to avoid observation run 

 quickly between the pinules of the Scotch fir, 

 Abies sylvestris, which tree they inhabit. They are 



