62 



[March, 



Williams {^EntomoJnqist, xlix, lOlG, p. 280), in recording both 

 sexes of Fhysotlirlps h/f/ts Bagn., remarks that the species is not so 

 small as the measurement given by me, being quite as large as P. ulmi- 

 fnliorum (Uzel nrc Halidav). I have an example of the species that 

 Williams evidently had in front of him ; it is a much larger and stouter 

 insect than the true P. latus, and I have ventured to describe it under 

 the \\A.vxQ proplnq^uiis. 



The '^ cousociafa^'' group maybe divided into two main groups — the 

 one with post-ocular bristles (containing latus and propinquus') and 

 the other without. It probably includes a large number of species, and 

 in addition to P. propinquus, I also describe P. )iavasi&\\({ P. hispanicus 

 taken l)y my good friend, Father Longinos Navas, to whom I find 

 ])articular pleasure in dedicating one of them. 



The types of the species descri1)ed herein are in ni}' collection. 



Style (7+8) of antennae long, one-ualf as long as joint t], with 

 8 distinctly longer than 7. 

 a. Puxt-uculur bristles present, chaetotaxj of fore ivimj and Sth nttdoniinal 

 tergite as in next group, b (aa). 



Physothrips prop>inquus, sp. n. 

 5. Length about I'l mm. 



Dull yellow, thorax and body very lightly touched with grey or liglit grey- 

 brown, last two abdominal segments brown. Auteunal joints 1 ai.d 3 p.de, 

 2 and 4 liglit grey-brown, 5 to 8 grey-brown, 5 paler basully. Wings yellowjsli- 

 grey. Cephalic and pronotal setae as in F. latus i^agn., but longer and stronger. 



Relative lengths of antennal joints 3 to 6 and style (7+8) approxi- 

 mately : 44 : 36 : 34 : 46 : 24 as compared with 38 : 28 : 26 : 36 : 20 in latus. 

 .Setae of lower vein in fore wing numbering eleven (9 in latus), longer than in 

 latus (7 to 8 as compared with 5) and set at intervals less than the length of 

 the bristles, whereas in latus these bristles are shorter aud set at intervals 

 greater than the length of the bristles. Hind margm of 8th abdominal tergite 

 with a longish irregular " comb." Bristles of 9 aud 10 dark, long and strong. 



ILab. Oxford, on Pinus, viii. 191-4. 



This is apparently the P. latus of Williams (nee Bagnall), and is 

 abundantly distinct in the larger size, the stronger and stouter chaeto- 

 taxy, and, especially, the chaetotaxy of the fore wings. It is more 

 deeply coloured than P. latus. 



Physothrips latus Bagn. 



The above notes will serve to distinguish this minute pallid insect 

 which is as yet only known from the original Northumbrian example. 



