Page:Tropical Diseases.djvu/351

SYNOPSIS OF THE GENUS

Asiatic and American Species
Marginal cell

Length of 2nd marginal cell 1/3 length of wing.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	(Head and abdomen brown; sides of thorax coxæ, and trochanters yellowish; legs, antennæ, and palpi grey; wings blue iridescence. P. argentipes (India).
Length of 2nd marginal cell more than 1/3 length of wing.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Grey, wings bluish iridescence. Greatest breadth of wing not quite 1/3 its length. P. major (India)
Length of 2nd marginal cell nearly 1/2 length of wing. Four spines on appendages of ♂.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Thorax, abdomen, and legs brown; wings purplish. Greatest breadth of wing 1/2 its length. P. malabaricus (India).
Length of 2nd marginal cell less than 1/4 length of wing.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Grey. Greatest breadth of wing between 1/4 and 1/5 its length. P. babu (India).
Length of 2nd marginal cell more than 1/3 length of wing. Superior appendages of ♂ bear three spines.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Yellowish-grey. Greatest breadth of wing slightly over 1/3 its length. P. himalayensis (India).
Length of 2nd marginal cell a little more than 1/4 length of wing.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Head and thorax yellowish-brown. Greatest breadth of wing 1/3 its length. P. perturbans (Java).
Length of 2nd marginal cell barely 1/3 length of wing.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Wings long and narrow. P. angustipennis (Java).
Length of 2nd marginal cell twice length of its petiole.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Yellow; mesonotum brown. P. vexator (N. America).
Length of 2nd marginal cell thrice length of its petiole.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Hairs chiefly yellow, otherwise like P. vexator P. cruciatus (Guatemala).
European Species Terminal segment of upper clasper
Terminal segment of upper clasper of ♂ slightly longer than lower segment.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Pale yellowish-grey; thorax dull red-brown with a median stripe. 2nd segment of palpi a little longer than 3rd. P. papatasii (Europe, Asia and Africa).
Terminal segment of upper clasper of ♂ slightly longer than lower segment.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Resembles P. papatasii, distinguished by darker integument and by shorter 6th longitudinal vein. P. nigerrimus (Europe).
Five spines of terminal segment of upper clasper very long and falciform, otherwise resembles P. papatasii.	$\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$	P. mascittii (Italy).
Terminal segment of upper clasper of ♂ half the length of the lower clasper.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Abdominal hairs more or less erect. 2nd and 3rd segments of palpi equal in length. P. perniciosus (Malta and Asia).
Terminal segment of upper clasper of ♂ with only four spine.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	2nd segment of palp half the length of the 3rd. Length of ♀ 2 mm P. minutus (Europe, Asia, and Africa)

Additional species have lately been described—P. rostrans (S. America) distinguished by the large size of its head, P. marginatus zeylanicus (Ceylon), P. antennatus (Gold Coast), P. squamipleuris (Khartoum), P. dubosqii (Africa), P. squamiventris and longipalpis (Brazil). It must be distinctly understood that this list is by no means final.